Chronic Pain: Symptoms, Causes, Types & Integrative Treatment NYC

Chronic Pain

Chronic Pain: Types, Causes, Central Sensitisation & Integrative Treatment in NYC

Chronic pain is not a symptom waiting to be explained — it is a distinct neurobiological condition in which the central nervous system has been reshaped by persistent nociceptive input, creating an amplified, self-sustaining pain state. If you have been told your tests are normal while your pain remains very real, you are not imagining it: you are experiencing the hallmark of a condition that standard medicine frequently misses.

51.6M

US adults living with chronic pain (CDC, 2021)

17.1M

experience high-impact chronic pain limiting daily life

$635B

annual US economic burden — healthcare + lost productivity

3–5 yrs

average time before patients receive accurate functional diagnosis

Medically reviewed by Dr. Rashmi Gulati, MD — Medical Director, Patients Medical.

Board-certified integrative medicine physician.

Clinical Definition

Chronic pain is defined by the International Association for the Study of Pain (IASP) and encoded in ICD-11 as pain that persists or recurs for more than three months, extending well beyond the normal expected period of tissue healing. Unlike acute pain — which serves a protective biological function — chronic pain involves maladaptive neuroplastic changes including central sensitisation, in which spinal cord dorsal horn neurons and supraspinal pain-processing centres (anterior cingulate cortex, insula, prefrontal cortex) undergo sensitisation and structural remodelling that perpetuates pain signalling independently of peripheral tissue damage. It encompasses nociceptive, neuropathic, and nociplastic subtypes, frequently co-occurs with depression, anxiety, and sleep disorders, and is now classified as a standalone disease entity requiring targeted, multimodal treatment.

Key Symptoms

Persistent widespread musculoskeletal aching
Allodynia — pain from light touch or pressure
Hyperalgesia — amplified pain to normal stimuli
Non-restorative sleep and profound fatigue
Cognitive impairment (brain fog, poor concentration)
Depression, anxiety, and emotional dysregulation

Primary Causes

Central sensitisation (neuroplastic remodelling)
Systemic inflammation — elevated IL-6, TNF-alpha
HPA axis dysregulation & cortisol irregularity
Mitochondrial dysfunction and oxidative stress
Gut dysbiosis driving LPS-mediated neuroinflammation
Micronutrient deficiencies (Mg, D3, B12, CoQ10)

Treatment Approach

Low-dose naltrexone (LDN) — microglial TLR4 inhibition
IV magnesium & nutrient infusion therapy
Anti-inflammatory personalised supplementation
Acupuncture & craniosacral therapy
Pain Neuroscience Education (PNE)
Gut microbiome restoration protocol

What is Chronic Pain?

Chronic pain is pain that refuses to follow the normal biological timeline. Acute pain — the kind you feel when you burn your hand or sprain an ankle — is a warning signal that fades as tissue heals, typically within days to weeks. Chronic pain is something fundamentally different: it is pain that persists for three months or longer, often without obvious tissue damage to explain it. This distinction is not philosophical; it reflects a measurable transformation in how the nervous system processes pain signals.

The central biological mechanism in chronic pain is a process called central sensitisation. Under normal circumstances, nociceptors — the sensory nerve endings that detect damage — send warning signals to the dorsal horn of the spinal cord, where they are modulated before being relayed to the brain. In chronic pain, repeated or intense nociceptive input causes the dorsal horn neurons to undergo long-term potentiation: they become persistently hyperexcitable, firing more readily and at lower thresholds. Simultaneously, descending inhibitory pathways from the brain — which normally dampen pain signals — become suppressed, and neuroinflammatory processes driven by activated microglia and elevated cytokines (IL-1β, IL-6, TNF-alpha) further amplify pain processing. The result is a self-sustaining pain cycle that continues even after the original injury has resolved.

Functional medicine approaches chronic pain with a lens that conventional medicine often lacks: the question of why the nervous system sensitised in the first place. The triggers for central sensitisation are frequently systemic — gut dysbiosis producing lipopolysaccharide (LPS) that crosses the blood-brain barrier, mitochondrial dysfunction impairing neuronal energy metabolism, micronutrient deficiencies disrupting nerve membrane stability, HPA axis dysregulation altering the pain inhibitory effects of cortisol, and toxic burden accumulating in neural tissue. Addressing these upstream drivers is what distinguishes a functional medicine chronic pain protocol from conventional symptom management.

Chronic pain affects an estimated 51.6 million Americans — approximately 20% of the adult population — making it the leading cause of disability and long-term prescription medication use in the United States. Women are disproportionately affected, particularly in fibromyalgia-type chronic pain syndromes, where the female-to-male ratio approaches 4:1. The economic burden exceeds $635 billion annually, and patients suffer an average of three to five years before receiving an accurate functional diagnosis that addresses root causes rather than simply managing pain perception.

The Dorsal Horn (Spinal Cord)

The spinal cord’s dorsal horn is the first relay station for pain signals ascending to the brain. In chronic pain, long-term potentiation of dorsal horn neurons reduces their activation threshold — so stimuli that normally would not register as painful (light touch, warmth) now trigger pain responses. This is the anatomical basis of allodynia and hyperalgesia.

Anterior Cingulate Cortex (ACC)

The ACC processes the affective, emotional dimension of pain — how much pain bothers you, not just its intensity. In chronic pain patients, the ACC shows hyperactivation on fMRI, magnifying the suffering component of pain. Reduced grey matter volume in the prefrontal cortex simultaneously impairs top-down pain inhibition, removing the brain’s natural brake on pain amplification.

Microglial Cells & Neuroinflammation

Microglial cells are the immune cells of the central nervous system. In chronic pain, microglia become chronically activated — releasing pro-inflammatory cytokines, substance P, and glutamate that perpetuate central sensitisation. Factors including gut-derived LPS, systemic inflammation, and psychological stress all activate microglial TLR4 receptors, maintaining this neuroinflammatory state.

Signs & Symptoms of Chronic Pain

Chronic pain rarely presents as pain alone — it is a systemic condition that disrupts every dimension of physiology, producing a constellation of symptoms that spans neurological, hormonal, cognitive, and gastrointestinal systems. Understanding this breadth is essential, because patients frequently receive piecemeal diagnoses for individual symptoms while the underlying central sensitisation driving all of them goes unaddressed.

Neurological & Sensory Symptoms

Allodynia

Non-painful stimuli — light touch, clothing contact, mild pressure — trigger genuine pain because central sensitisation has lowered the activation threshold of wide-dynamic-range neurons in the dorsal horn.

Hyperalgesia

Normal painful stimuli produce an exaggerated, disproportionate pain response due to amplified central processing and reduced descending inhibitory pathway activity.

Widespread musculoskeletal aching

Diffuse, migratory aching in muscles, joints, and connective tissue — often bilateral and affecting multiple body regions — reflects the systemic nature of central sensitisation rather than localised tissue damage.

Headaches and migraines

Chronic pain commonly co-occurs with recurrent tension headaches and migraines, sharing the mechanism of trigeminovascular sensitisation and reduced central serotonergic inhibition.

Burning or electric sensations

Dysaesthetic pain — burning, stabbing, or electric shock sensations — indicates a neuropathic component, with ectopic discharge in sensitised peripheral afferents or altered spinal cord processing.

Heightened sensitivity to light, sound, and smell

Central sensitisation generalises to non-pain sensory modalities: the same neuroplastic amplification that magnifies pain also reduces thresholds for visual, auditory, and olfactory processing in thalamic relay nuclei.

Cognitive & Mental Health Symptoms

Cognitive impairment (brain fog)

Neuroinflammation, disrupted sleep architecture, and altered prefrontal blood flow combine to impair working memory, attention, processing speed, and word retrieval — the cluster often called "fibro fog" or "pain brain."

Depression

Chronic pain and major depressive disorder share overlapping neurobiology — both involve reduced serotonin and dopamine availability, HPA axis hyperactivation, and altered prefrontal-limbic connectivity. Prevalence of clinical depression in chronic pain populations is 30–50%.

Anxiety and hypervigilance

A sensitised amygdala maintains a state of threat hypervigilance, interpreting bodily sensations as dangerous and perpetuating the fear-avoidance cycle that amplifies pain and disability.

Emotional dysregulation

Reduced prefrontal cortex volume and altered limbic connectivity impair emotional regulation, contributing to irritability, emotional lability, and difficulty managing stress that would otherwise be manageable.

Post-exertional malaise

Physical or mental exertion beyond a personalised threshold triggers disproportionate symptom flares — typically peaking 12–48 hours after activity — reflecting autonomic nervous system dysregulation and mitochondrial stress.

Energy & Sleep Symptoms

Non-restorative sleep

Electroencephalographic studies document alpha-wave intrusion into delta-wave (deep) sleep in chronic pain patients, preventing the restorative slow-wave sleep necessary for tissue repair, growth hormone release, and pain threshold normalisation.

Profound fatigue

Chronic pain imposes an enormous metabolic burden on the nervous system; simultaneously, mitochondrial dysfunction reduces cellular ATP production, resulting in a fatigue that is not relieved by rest and qualitatively different from ordinary tiredness.

Worsened pain after sleep deprivation

Even one night of disrupted sleep measurably lowers pain thresholds the following day — creating a vicious cycle in which chronic pain worsens sleep, and poor sleep worsens pain sensitisation.

Morning stiffness and pain

Pain that is most severe upon waking and for the first hour of the day reflects the pro-inflammatory cytokine surge (particularly IL-6) that peaks in early morning in chronic inflammatory states.

Afternoon energy crashes

Blunted cortisol awakening response and flattened diurnal cortisol curve — common in chronic pain — produce predictable mid-afternoon energy nadirs and impair sustained physical or cognitive performance.

Physical & Systemic Symptoms

Gastrointestinal dysregulation

Chronic pain frequently co-occurs with IBS, bloating, constipation, and diarrhoea — not incidentally, but because the enteric nervous system and central nervous system share sensitisation mechanisms and the gut-brain axis bidirectionally amplifies both pain and GI symptoms.

Pelvic pain and urinary urgency

Referred sensitisation from the central nervous system can manifest as pelvic floor tension, interstitial cystitis symptoms, and dysmenorrhea — conditions that frequently cluster with fibromyalgia and generalised chronic pain.

Immune dysregulation and recurrent infections

HPA axis dysfunction impairs cortisol-mediated immune regulation, producing a paradox of chronic low-grade inflammation alongside increased vulnerability to viral and bacterial infections.

Weight gain and metabolic changes

Elevated cortisol promotes visceral fat deposition; reduced physical activity from pain lowers metabolic rate; gabapentinoid and tricyclic medications used in pain management directly cause weight gain through appetite stimulation and fluid retention.

Cardiovascular symptom amplification

Chronic pain is associated with increased sympathetic nervous system activation, elevated resting heart rate, reduced heart rate variability (HRV), and independently increased cardiovascular disease risk.

The 4 Types of Chronic Pain: A Functional Medicine Framework

Chronic pain does not have a single formal staging system like cancer, but it is meaningfully classified into four mechanistic types — nociceptive, neuropathic, nociplastic, and mixed because each type has a distinct biological driver and responds best to different treatment targets. Accurate classification is the first step in building an effective treatment protocol.

01 Nociceptive Chronic Pain

Biomarker: Elevated hs-CRP · Active inflammatory markers

Nociceptive chronic pain originates from ongoing activation of nociceptors by persistent tissue damage, inflammation, or mechanical stress. The pain signal is proportional to an identifiable source — osteoarthritis eroding cartilage, rheumatoid arthritis inflaming synovial membranes, or chronic muscle tension compressing nerve roots. Unlike acute nociceptive pain, the chronic form involves peripheral sensitisation: nociceptors become hypersensitised in the local environment through prostaglandins, bradykinin, and substance P released by damaged tissue, lowering their activation threshold and generating spontaneous firing.

Typically affects: patients with osteoarthritis, rheumatoid arthritis, chronic low back pain from disc degeneration, and inflammatory bowel disease-related pain.

02 Neuropathic Chronic Pain

Biomarker: Abnormal nerve conduction · Small fibre neuropathy on skin biopsy

Neuropathic pain arises from damage or dysfunction in the somatosensory nervous system itself — peripheral nerves, dorsal root ganglia, or central pathways. The classic descriptors are burning, electric shock-like, or stabbing sensations, often accompanied by allodynia and hyperalgesia. Diabetic peripheral neuropathy, post-herpetic neuralgia, chemotherapy-induced peripheral neuropathy, and trigeminal neuralgia are all neuropathic chronic pain conditions. Ectopic discharge from injured axons and maladaptive sodium channel upregulation (Nav1.7, Nav1.8) drive spontaneous firing that continues independent of peripheral stimulation.

Typically affects: patients with diabetes, prior herpes zoster infection, multiple sclerosis, spinal cord injury, or following chemotherapy.

03 Nociplastic Chronic Pain

Biomarker: Normal MRI/imaging · Elevated substance P · Altered QST thresholds

Nociplastic pain — a category formally recognised by the IASP in 2017 — arises from altered nociception without clear evidence of tissue damage or somatosensory nerve injury. The mechanism is central sensitisation: the central nervous system’s pain-processing circuitry has been neuroplastically remodelled to generate, amplify, and sustain pain signals in the absence of an identifiable peripheral driver. Fibromyalgia, irritable bowel syndrome, interstitial cystitis, and tension headache are prototypical nociplastic conditions. Quantitative sensory testing (QST) reveals altered detection thresholds, and functional MRI shows dysregulation of default mode, salience, and sensorimotor networks.

Typically affects: predominantly women; patients with fibromyalgia, functional pain syndromes, chronic fatigue syndrome, and a history of adverse childhood experiences or psychological trauma.

04 Mixed Chronic Pain

Biomarker: Overlapping inflammatory + neuropathic + central markers

The majority of patients presenting to Patients Medical with chronic pain fall into a mixed category — where two or more pain mechanisms co-exist and interact. A patient with lumbar disc degeneration (nociceptive) may develop nerve root compression (neuropathic) and, over time, central sensitisation (nociplastic) — creating a pain experience that is simultaneously driven by tissue damage, nerve injury, and neuroplastic amplification. Mixed chronic pain is the most clinically complex type and requires multi-target treatment: addressing peripheral inflammation, supporting nerve repair, and remodelling central sensitisation simultaneously. This is exactly the kind of case where functional medicine’s systems approach — testing multiple biological systems and treating them in parallel — produces outcomes that single-pathway approaches cannot match.

Typically affects: patients with long-duration chronic pain, multiple co-morbid conditions, or those who have not responded to conventional single-modality treatments.

What Causes Chronic Pain? Root Causes & Risk Factors

Chronic pain almost never has a single cause. It emerges from the intersection of multiple biological, environmental, and psychosocial factors that collectively overwhelm the body’s endogenous pain-inhibitory systems. Identifying which factors are operative in a given patient — through targeted functional testing — is the cornerstone of effective treatment.

01

Central Sensitisation

Long-term potentiation of dorsal horn neurons reduces pain signal thresholds, creating an amplified, self-sustaining pain state independent of peripheral tissue damage.

02

Systemic Neuroinflammation

Elevated pro-inflammatory cytokines — IL-6, IL-1β, TNF-alpha — cross the blood-brain barrier via active transport and circumventricular organs, activating microglial cells and sustaining central pain sensitisation.

03

Gut Dysbiosis & Leaky Gut

Disrupted gut microbiome diversity and increased intestinal permeability allow lipopolysaccharide (LPS) — a bacterial endotoxin — to enter systemic circulation and trigger TLR4-mediated neuroinflammation.

04

HPA Axis Dysregulation

Chronic stress dysregulates hypothalamic-pituitary-adrenal axis function, producing abnormal cortisol patterning (typically a blunted awakening response and flattened diurnal curve) that removes cortisol’s anti-inflammatory and pain-inhibitory effects.

05

Mitochondrial Dysfunction

Impaired mitochondrial ATP production in peripheral and central neurons reduces their ability to maintain ion gradients and regulate membrane excitability, lowering pain thresholds and impairing endogenous analgesia mechanisms.

06

Magnesium Deficiency

Magnesium is a natural NMDA receptor antagonist — blocking the channel through which glutamate drives central sensitisation. Deficiency (documented in up to 80% of chronic pain patients) removes this physiological brake on pain amplification.

07

Vitamin D3 Insufficiency

Vitamin D3 receptors are expressed throughout the nervous system; D3 regulates pro-inflammatory cytokine production and nerve growth factor synthesis. Serum 25-OH-D3 below 30 ng/mL correlates strongly with increased pain severity.

08

Psychological Trauma & ACEs

Adverse childhood experiences (ACEs) and psychological trauma produce lasting epigenetic changes in stress-response genes and alter limbic pain-modulating circuits, creating heightened pain sensitivity that persists into adulthood.

09

Sleep Architecture Disruption

Non-restorative sleep — particularly reduced slow-wave (delta) sleep — impairs glymphatic clearance of neuroinflammatory waste products, prevents pain threshold restoration, and elevates substance P levels the following day.

10

Heavy Metal Toxicity

Lead, mercury, and cadmium accumulate in neural tissue, impair mitochondrial function, promote oxidative stress, and displace essential minerals (zinc, magnesium) from enzyme binding sites — all of which potentiate nociceptive signalling.

11

Hormonal Imbalances

Oestrogen modulates endogenous opioid receptor expression and descending inhibitory pathway tone; low progesterone impairs GABA-ergic pain inhibition; low testosterone in men reduces central opioid receptor density — all increasing pain vulnerability.

12

Genetic Predisposition

Polymorphisms in the COMT gene (catechol-O-methyltransferase, affecting dopamine metabolism), GCH1 (GTP cyclohydrolase-1, affecting tetrahydrobiopterin and nitric oxide), and TRPV1 (pain receptor sensitivity) significantly modulate pain sensitivity and chronic pain risk.

Chronic Pain vs. Related Conditions: How to Tell the Difference

Chronic pain overlaps with — and is frequently confused with — several other conditions that share symptoms but have distinct mechanisms and diagnostic criteria. The table below compares chronic pain syndrome against fibromyalgia, chronic fatigue syndrome (ME/CFS), and rheumatoid arthritis, the four conditions most commonly presenting together or being mistaken for one another in clinical practice.

Feature	Chronic Pain Syndrome	Fibromyalgia	ME/CFS	Rheumatoid Arthritis
Core mechanism	Central sensitisation ± peripheral input	Nociplastic — pure central sensitisation	Mitochondrial dysfunction + immune dysregulation	Autoimmune synovial inflammation (anti-CCP antibodies)
Key biomarker	Elevated hs-CRP, substance P, OAT mitochondrial markers	Elevated substance P; normal inflammatory markers	Elevated IL-6, NK cell dysfunction; abnormal CPET results	Positive RF and anti-CCP IgG antibodies; elevated ESR
Best diagnostic test	Quantitative Sensory Testing (QST) + inflammatory panel	ACR 2016 criteria (WPI + SSS scoring)	Cardiopulmonary exercise testing (2-day CPET)	Anti-CCP antibody test + joint ultrasound/X-ray
Hallmark symptom	Pain disproportionate to identifiable tissue damage	Widespread pain + tenderness + cognitive impairment	Post-exertional malaise + unrefreshing sleep	Symmetrical joint swelling, morning stiffness >1 hour
Standard blood test	Often normal — misses root causes	Usually entirely normal	Often normal; NK cell function requires specialist testing	Positive — elevated CRP, ESR, RF, anti-CCP
Treatment approach	Root-cause multimodal: LDN, nutrients, gut, neuro	PNE, LDN, magnesium, sleep restoration	Pacing, mitochondrial support, immune modulation	DMARDs (methotrexate) + biologics + anti-inflammatory

Important clinical overlap: Fibromyalgia is present in approximately 25–30% of patients who also have a definitive diagnosis of rheumatoid arthritis — meaning the two conditions frequently co-exist and the fibromyalgia component often goes untreated in rheumatology settings. If you have a confirmed autoimmune condition but your pain remains poorly controlled on standard treatment, a central sensitisation component is a common and underappreciated reason.

Is Chronic Pain Taken Seriously by Conventional Medicine? The Honest Answer

Chronic pain — particularly nociplastic pain syndromes like fibromyalgia — occupies contested terrain in medicine. Patients often report years of being told their pain is psychological, their tests are normal, or that they should simply manage with anti-depressants and exercise. Here is an honest comparison of where conventional and functional medicine currently stand:

01 Conventional Medicine's Position

Chronic pain is increasingly recognised as a legitimate neurological condition, particularly since the ICD-11 classification in 2019 introduced chronic primary pain as a standalone diagnosis.
Standard treatment focuses on pharmacological management: NSAIDs, opioids (now restricted), gabapentinoids, SNRIs, and tricyclic antidepressants — primarily symptom suppression rather than root cause resolution.
Pain clinics typically offer nerve blocks, spinal cord stimulation, and multidisciplinary pain rehabilitation programmes — effective for some patients, inaccessible to many.
Psychological components (CBT, pain neuroscience education) are increasingly incorporated but are often siloed from biological interventions.
The mechanisms of nociplastic pain are well-documented in research literature but infrequently applied in primary care clinical settings.

02 Functional Medicine's Perspective

Chronic pain is a systemic condition with identifiable, modifiable biological drivers — not merely a symptom to suppress, but a signal to decode and resolve.
Standard pharmaceutical management addresses neurotransmitter endpoints without addressing the upstream causes: gut dysbiosis, micronutrient deficiency, mitochondrial dysfunction, and HPA axis dysregulation.
Functional testing reveals driver profiles that standard panels miss — including OAT mitochondrial markers, inflammatory cytokine panels, salivary cortisol curves, and comprehensive microbiome analysis.
Low-dose naltrexone (LDN), magnesium optimisation, gut restoration, and targeted nutrient therapy address mechanisms that conventional protocols rarely touch.
The goal is not pain tolerance — it is biological correction of the conditions that allow pain to persist.

Patients Medical’s position: We respect and collaborate with conventional medicine — pain clinics, rheumatologists, and neurologists provide essential care that functional medicine does not replace. What we offer is a complementary layer: systematic root-cause testing and targeted biological intervention for the factors that conventional medicine does not measure. Many of our patients have active conventional care relationships and use our protocols to accelerate their recovery. We do not ask you to choose between approaches — we ask you to ensure your care is complete.

How We Diagnose Chronic Pain in NYC

Standard chronic pain diagnosis relies on patient-reported pain scales and imaging — tools that confirm pain is present without explaining why. Our approach at Patients Medical adds a layer of functional diagnostic testing that maps the biological drivers specific to each patient, enabling a genuinely personalised treatment protocol.

01 High-Sensitivity Inflammatory Cytokine Panel

We measure high-sensitivity C-reactive protein (hs-CRP), interleukin-6 (IL-6), interleukin-1β, and tumour necrosis factor-alpha (TNF-alpha) — the four cytokines most directly implicated in microglial activation and central sensitisation maintenance. Standard CRP misses low-grade neuroinflammation; the hs-CRP assay detects inflammation at levels between 0.5–3.0 mg/L that drives chronic pain but falls below the threshold of routine inflammation detection. This panel reveals whether neuroinflammation is the dominant driver, determines the urgency of anti-inflammatory intervention, and provides a baseline against which treatment response is measured.

02 Comprehensive Micronutrient & Metabolic Panel

We measure serum and intracellular levels of magnesium (RBC magnesium is more accurate than serum), 25-OH vitamin D3, vitamin B12 and methylmalonic acid (functional B12 status), coenzyme Q10, and zinc — all essential cofactors for neuronal energy metabolism, NMDA receptor regulation, and endogenous opioid peptide synthesis. Deficiencies are documented in the majority of chronic pain patients in clinical practice and represent immediately modifiable drivers.

03 Salivary Cortisol & Adrenal Stress Index

We collect four salivary cortisol samples across the day — upon waking, at noon, at 4pm, and at bedtime — and measure DHEA-S simultaneously to construct a complete picture of HPA axis function. The cortisol awakening response (CAR) — the 50–100% surge in cortisol in the first 30 minutes after waking — is a specific indicator of HPA axis integrity. A blunted or absent CAR is documented in fibromyalgia and chronic pain and reflects impaired central pain inhibition, since cortisol is the body’s primary endogenous anti-inflammatory hormone.

04 Organic Acid Testing (OAT) — Mitochondrial & Neurotransmitter Profile

The Organic Acid Test is a urine analysis measuring over 70 metabolic markers, including citric acid cycle intermediates (indicating mitochondrial dysfunction), oxidative stress markers (8-hydroxy-2-deoxyguanosine), and neurotransmitter metabolites — 5-HIAA (serotonin), HVA and VMA (dopamine and norepinephrine), kynurenic and quinolinic acid (tryptophan metabolism via the neuroinflammatory kynurenine pathway). Elevated quinolinic acid specifically indicates activated microglial NMDA receptor-mediated excitotoxicity — a direct biomarker of central sensitisation.

05 Comprehensive Stool Analysis with Microbiome Mapping

We use PCR-based comprehensive stool analysis to quantify commensal bacterial diversity, identify pathogenic bacteria and parasites, measure short-chain fatty acid (SCFA) production, assess secretory IgA (intestinal immune function), and evaluate calprotectin (gut wall inflammation) and zonulin (intestinal permeability). Gut-derived lipopolysaccharide (LPS) is one of the most powerful activators of microglial TLR4 receptors; a disrupted microbiome generating excess LPS is a frequently overlooked driver of neuroinflammation and chronic pain. Our stool testing programme provides a comprehensive intestinal health profile.

Does This Sound Like You?

Check all that apply to your current experience:

I have pain that has lasted more than 3 months and has no clear diagnosis
My imaging (MRI, X-ray) comes back normal, but the pain is real
Light touch, clothing contact, or mild pressure causes pain
My pain is significantly worse after poor sleep
I also experience fatigue, brain fog, or cognitive difficulty
I have anxiety or depression alongside my pain
I have digestive issues (IBS, bloating, irregular bowels)
I have tried multiple treatments with limited or temporary relief
My pain moves around or affects multiple body areas

Chronic Pain Treatment at Patients Medical NYC

Effective chronic pain treatment does not begin with a prescription — it begins with a map. Our physicians at Patients Medical first construct a patient-specific root-cause profile through comprehensive functional testing, then build a personalised treatment protocol targeting each identified driver simultaneously. The goal is not to reduce your pain score by two points; it is to systematically dismantle the conditions that allow chronic pain to persist.

Low-Dose Naltrexone (LDN) Therapy

Low-dose naltrexone (1.5–4.5 mg nightly) is one of the most compelling pharmacological tools in functional chronic pain management. At these doses, LDN does not act as an opioid antagonist — it transiently blocks opioid receptors for 4–6 hours, triggering compensatory upregulation of endogenous opioid production, while simultaneously inhibiting toll-like receptor 4 (TLR4) on microglial cells, directly suppressing the neuroinflammatory cascade driving central sensitisation. Clinical trials in fibromyalgia show 30% reductions in pain, and patient series in complex chronic pain show response rates exceeding 50%.

Naltrexone 1.5–4.5mg

TLR4 inhibition

Microglial modulation

Endorphin upregulation

IV Nutrient & Magnesium Infusion Therapy

Intravenous delivery bypasses gastrointestinal absorption limitations and achieves therapeutic serum concentrations impossible with oral supplementation. Our chronic pain IV protocols deliver high-dose magnesium sulphate — which directly blocks NMDA receptors in the dorsal horn, interrupting central sensitisation at its source — along with B-complex vitamins, vitamin C (antioxidant and collagen support), alpha-lipoic acid, and glutathione for oxidative stress reduction. Many patients notice meaningful pain reduction within 24–48 hours of the first infusion, making IV therapy both a treatment and a diagnostic tool for nutrient-driven pain.

Magnesium sulphate IV

High-dose vitamin C

Alpha-lipoic acid

Glutathione

B-complex IV

Personalised Anti-Inflammatory Supplementation

Based on your individual biomarker profile, we prescribe a targeted supplement protocol addressing your specific deficiencies and inflammatory drivers. This typically includes: magnesium glycinate (400–600 mg daily) as an oral NMDA antagonist; vitamin D3 + K2 to achieve optimal 25-OH-D3 of 60–80 ng/mL; palmitoylethanolamide (PEA, 1200 mg daily) as a PPAR-alpha agonist that reduces neuroinflammation without psychoactivity; BCM-95 curcumin with piperine for NF-kB inhibition; and coenzyme Q10 (300 mg) for mitochondrial support. Supplement dosages are calibrated to testing results and adjusted at follow-up.

Magnesium glycinate

Vitamin D3/K2

CoQ10

BCM-95 curcumin

PEA (palmitoylethanolamide)

Acupuncture & Craniosacral Therapy

Acupuncture achieves measurable analgesic effects through multiple mechanisms: stimulation of Aδ and C afferent fibres activates the endogenous opioid system (releasing beta-endorphin, met-enkephalin, and dynorphin at spinal and supraspinal levels); needle insertion triggers segmental inhibition in the dorsal horn; and fMRI studies document deactivation of the limbic system pain matrix following acupuncture treatment. Craniosacral therapy normalises autonomic nervous system tone, reducing sympathetic hyperactivation that sustains central sensitisation. Both therapies are available at our NYC clinic.

Medical acupuncture

Craniosacral therapy

Endorphin release

Autonomic regulation

Pain Neuroscience Education (PNE) & Mind-Body Integration

Pain Neuroscience Education is a structured cognitive-educational intervention that teaches patients the biology of their own pain — specifically, how central sensitisation works, why pain does not equal damage, and how the brain and nervous system can be retrained. Randomised controlled trials demonstrate that PNE reduces pain intensity, disability, and catastrophising more effectively than anatomy-based pain education alone. We integrate PNE with breathwork protocols targeting parasympathetic activation, heart rate variability (HRV) training, and mindfulness-based stress reduction (MBSR) — all of which produce measurable neurological changes in pain-processing circuits over 8–12 weeks of consistent practice.

Pain Neuroscience Education

MBSR

HRV biofeedback

4-7-8 breathing

Gut Microbiome Restoration Protocol

Addressing gut dysbiosis is a cornerstone of our chronic pain protocol — not because “fixing the gut” is a cure-all, but because gut-derived LPS entering systemic circulation is a documented activator of the microglial neuroinflammation driving central sensitisation. Our gut restoration protocol includes elimination of identified microbial pathogens, reintroduction of commensal diversity through evidence-based probiotic species (Lactobacillus rhamnosus GG, Bifidobacterium longum, Faecalibacterium prausnitzii-promoting prebiotics), intestinal permeability repair with L-glutamine (5–10 g daily), zinc carnosine, and deglycyrrhizinated liquorice (DGL), and a personalised elimination diet targeting your individual inflammatory food triggers.

Targeted probiotics

L-glutamine 5-10g

Zinc carnosine

Prebiotic fibres

Elimination diet

What to Expect: Treatment Timeline & Monitoring

Weeks 1–4	Initial protocol implementation, IV therapy series (3–6 sessions), oral supplement initiation, and Pain Neuroscience Education sessions. Most patients notice improved sleep quality first, followed by modest pain reduction.
Weeks 6–12	Meaningful improvement in pain intensity (typically 20–40% reduction on Brief Pain Inventory), reduced allodynia, and improved cognitive clarity. Gut restoration effects become measurable. LDN titrated to therapeutic dose.
Months 3–6	Significant functional recovery — reduced medication dependence, improved exercise tolerance, and better emotional regulation. Repeat biomarker testing confirms biological normalisation. Protocol refinement based on results.
Months 6–18	Progressive independence from clinical interventions, consolidation of lifestyle changes, maintenance supplement protocol, and annual re-testing. Many patients achieve sustained remission; all patients achieve improved function.

Lifestyle Practices for Chronic Pain Recovery

Lifestyle modifications are not adjuncts to chronic pain treatment — they are primary interventions that directly address the neurobiological mechanisms sustaining your pain. The practices below are not suggestions for “stress reduction”; each has a specific documented mechanism of action in central sensitisation and neuroinflammation.

Daily Parasympathetic Activation: 4-7-8 Breathing (10 min)

Inhale through the nose for 4 counts, hold for 7, exhale through the mouth for 8. This specific ratio activates the vagus nerve and stimulates the parasympathetic nervous system, reducing sympathetic hyperactivation that sustains central sensitisation. Heart rate variability (HRV) — a marker of autonomic balance — improves measurably after 4–6 weeks of daily practice. Perform twice daily: immediately upon waking (before checking your phone) and before sleep.

Graded Movement — 20 min Daily Walk at Conversational Pace

Aerobic exercise at 40–60% of maximum heart rate (the "conversational pace" where you can speak in full sentences) stimulates endogenous opioid release, increases brain-derived neurotrophic factor (BDNF) — which supports neuroplastic recovery — and reduces pro-inflammatory cytokines without triggering post-exertional malaise. Start with 10 minutes daily, increasing by 2 minutes each week. Avoid pushing into pain flares: the goal is neurological conditioning, not fitness training, and exceeding your current tolerance is counterproductive.

Sleep Architecture Optimisation: Consistent 10pm–6am Schedule

Circadian consistency — going to bed and waking at the same time seven days a week — is the single most impactful intervention for sleep architecture, anchoring the cortisol awakening response and maximising slow-wave sleep. Create complete darkness (blackout curtains, no screens), keep bedroom temperature at 65–68°F (18–20°C), and avoid screens for 90 minutes before bed (blue light suppresses melatonin production, delaying sleep onset by 1–3 hours). Magnesium glycinate 400 mg taken 30 minutes before bed improves sleep architecture through GABA receptor potentiation.

Morning Cold Water Face Immersion (30 seconds)

Submerging your face in cold water (10–15°C) for 30 seconds activates the diving reflex via the trigeminal nerve, producing an immediate and powerful parasympathetic shift — slowing heart rate and reducing sympathetic tone. This is a brief, accessible technique for acute pain-anxiety spirals. It also reduces cortisol and activates vagal tone, providing a rapid reset to the autonomic nervous system's baseline. For those with cardiovascular conditions, consult your physician before beginning.

Pain Journalling: Expressive Writing (15 min, 3× per week)

James Pennebaker's extensive research programme demonstrates that structured expressive writing — writing continuously about your deepest thoughts and feelings regarding your pain and its impact on your life — reduces pain severity, decreases healthcare utilisation, and improves immune markers over 3–4 weeks. Unlike ordinary journalling, expressive writing requires confronting emotional content, not avoiding it. Write for 15 minutes, three times per week, for four consecutive weeks. Do not re-read immediately; allow 24 hours.

Social Engagement as Neurological Medicine

Social isolation is an independent amplifier of central sensitisation — the same neural circuits that process physical pain also process social pain (the dorsal anterior cingulate cortex), and loneliness measurably raises inflammatory cytokine levels. Prioritise one meaningful social interaction daily — not passively scrolling social media, but active engagement: a telephone conversation, a shared meal, a group activity. Volunteer work, group exercise classes, and support groups for chronic pain patients all provide both social connection and the analgesic benefit of purpose and belonging.

Diet & Nutrition Guide for Chronic Pain

Diet directly modulates the inflammatory and neuroinflammatory processes driving chronic pain. The Western dietary pattern — high in refined carbohydrates, industrial seed oils, processed meats, and food additives — consistently elevates IL-6, TNF-alpha, and LPS translocation from a dysbiotic gut, amplifying central sensitisation. An anti-inflammatory dietary approach reduces these same cytokines, supports gut barrier repair, provides the precursors for neurotransmitter synthesis, and supplies the mitochondrial cofactors essential for neuronal energy metabolism. Diet is not a substitute for targeted medical treatment, but for many patients it is the foundation that allows every other intervention to work.

The Single Most Important Dietary Change

Eliminate all refined vegetable and seed oils (canola, soybean, corn, sunflower, safflower) and replace them with extra virgin olive oil, avocado oil, and ghee. Industrial seed oils are extremely high in omega-6 linoleic acid, which is a direct precursor to arachidonic acid and the pro-inflammatory prostaglandin-2 and leukotriene-4 cascade — the same pathways that NSAIDs are designed to block. Eliminating these oils is, in effect, a dietary anti-inflammatory intervention acting through the same mechanism as ibuprofen, without the gastrointestinal or cardiovascular risks.

Eat — Foods That Support Chronic Pain Recovery

Wild-caught fatty fish (salmon, sardines, mackerel): Highest dietary source of EPA and DHA omega-3s, which competitively inhibit arachidonic acid conversion and directly reduce IL-6, TNF-alpha, and substance P.
Dark leafy greens (spinach, kale, Swiss chard): Rich in magnesium, folate (essential for methylation and dopamine synthesis), and vitamin K2; polyphenols reduce NF-kB-mediated inflammatory gene expression.
Berries (blueberries, raspberries, blackberries): Anthocyanins and pterostilbene cross the blood-brain barrier and reduce microglial activation and neuroinflammatory cytokine production directly in pain-processing centres.
Garlic and onions: Allicin and quercetin inhibit mast cell degranulation (reducing histamine-mediated pain sensitisation) and suppress NF-kB signalling at concentrations achievable through dietary intake.
Turmeric with black pepper: Curcumin in food form provides low but consistent NF-kB inhibition; piperine in black pepper increases curcumin bioavailability by 2000% through P-glycoprotein inhibition.
Avocado and avocado oil: Rich in oleic acid (which stimulates PPAR-alpha, the same receptor targeted by PEA supplementation) and lutein, which reduces neuroinflammatory oxidative stress.
Sweet potatoes and colourful root vegetables: Provide beta-carotene (antioxidant precursor to vitamin A), B6 (essential for GABA synthesis and pain inhibition), and magnesium in a bioavailable food form.
Pasture-raised eggs: Complete amino acid profile supporting endorphin and neurotransmitter synthesis; choline (abundant in egg yolks) is essential for acetylcholine production in pain-inhibitory pathways.
Green tea (2–4 cups daily): EGCG (epigallocatechin gallate) inhibits NF-kB and AP-1 inflammatory transcription factors; L-theanine reduces anxiety-amplified pain without sedation.

Avoid — Foods That Worsen Chronic Pain

Industrial seed oils (canola, soybean, corn, sunflower): Highest dietary source of pro-inflammatory omega-6 arachidonic acid precursors; directly amplify prostaglandin-E2 and leukotriene-4 production.
Refined sugar and high-fructose corn syrup: Acutely elevates IL-6 and CRP within 30 minutes of consumption; promotes gut dysbiosis that increases LPS translocation and microglial activation.
Refined grains (white bread, pasta, crackers): Rapid glycaemic impact drives insulin spikes that promote arachidonic acid synthesis and reduce anti-inflammatory adiponectin secretion.
Artificial sweeteners (aspartame, sucralose): Disrupt gut microbiome diversity — particularly Lactobacillus and Bifidobacterium species — within 7 days of regular consumption, promoting dysbiosis-driven neuroinflammation.
Alcohol (more than 1 drink weekly): Disrupts intestinal tight junctions within 24 hours (increasing LPS translocation), suppresses restorative sleep architecture, and impairs liver glutathione synthesis necessary for oxidative stress management.
Ultra-processed foods with food additives: Carrageenan, polysorbate 80, and carboxymethylcellulose directly disrupt intestinal mucus layers and promote gut dysbiosis; titanium dioxide (E171) has documented pro-inflammatory effects in human studies.
Grain-fed processed red meat (daily): High arachidonic acid content and saturated fat load promote inflammatory eicosanoid synthesis; advanced glycation end products (AGEs) in charred/processed meats activate RAGE receptors driving NF-kB inflammation.
Caffeine after noon (for poor sleepers): Caffeine's adenosine receptor blockade has a half-life of 5–7 hours; afternoon consumption significantly impairs deep sleep architecture, removing the nightly pain threshold reset provided by restorative sleep.

Related & Overlapping Conditions

Chronic pain rarely presents in isolation — it exists within a web of overlapping conditions that share biological mechanisms, diagnostic features, and treatment targets. Understanding these relationships prevents fragmented care and ensures that co-existing drivers are addressed simultaneously.

Fibromyalgia

Fibromyalgia is the most precisely defined nociplastic chronic pain syndrome, affecting an estimated 2–4% of the population and sharing central sensitisation, sleep disruption, and cognitive symptoms with generalised chronic pain. Up to 60% of chronic pain patients meet partial or full fibromyalgia criteria. The distinction matters for treatment — fibromyalgia-specific protocols include LDN, specific sleep stage restoration, and PNE.

Chronic Fatigue Syndrome (ME/CFS)

ME/CFS and chronic pain share HPA axis dysregulation, mitochondrial dysfunction, and neuroinflammation — making them frequent comorbidities. Post-exertional malaise is the distinguishing feature of ME/CFS. Approximately 30–50% of ME/CFS patients report chronic widespread pain as a prominent feature, and the conditions often co-exist and reinforce one another through shared biological mechanisms.

Leaky Gut Syndrome

Intestinal hyperpermeability (leaky gut) enables LPS to enter systemic circulation, where it activates TLR4 receptors on microglia and amplifies the neuroinflammation sustaining central sensitisation. Leaky gut is not merely a digestive condition — it is a direct upstream driver of chronic pain via the gut-brain axis. Repairing intestinal barrier integrity is a primary component of our chronic pain protocol.

Adrenal Fatigue / HPA Axis Dysregulation

Blunted cortisol production from chronic stress and HPA axis exhaustion removes the body’s primary endogenous anti-inflammatory mechanism. Low cortisol fails to suppress NF-kB-mediated cytokine production, directly amplifying the inflammatory burden driving chronic pain. Restoring healthy HPA axis function — through adaptogenic herbs, sleep correction, and targeted nutrient support — is a cornerstone of chronic pain management.

Depression & Anxiety

Depression and anxiety are not merely psychological responses to chronic pain — they are neurobiological co-manifestations of the same central sensitisation and HPA axis dysregulation driving the pain itself. Treating them separately from chronic pain is clinically suboptimal; our approach addresses the shared neural substrate simultaneously through nutritional neuroscience, HPA axis normalisation, and mind-body integration.

Sleep Disorders

Insomnia and non-restorative sleep are both consequence and cause of chronic pain — alpha-wave intrusion into slow-wave sleep prevents the nightly pain threshold reset that healthy sleep provides, while pain itself fragments sleep architecture. Sleep disorders and chronic pain must be treated simultaneously rather than sequentially; sleep restoration is one of the fastest routes to meaningful pain reduction.

When to See a Doctor About Chronic Pain

Many people with chronic pain delay seeking help — either because they have been dismissed before, because they are accustomed to managing, or because they are not sure whether their symptoms warrant medical attention. The answer is: your pain is always worth evaluating. The question is what kind of evaluation will actually serve you. Here is a framework for knowing when to act and what kind of care to seek.

Seek a Functional Medicine Evaluation if You Are Experiencing:

Pain lasting more than 3 months without a satisfactory explanation or effective treatment
Multiple unexplained symptoms alongside pain (fatigue, brain fog, digestive issues, sleep disruption)
Sensitivity to light touch, clothing, or mild pressure that was not present before
Pain accompanied by significant mood changes — depression, anxiety, or emotional dysregulation
A history of opioid or gabapentinoid prescriptions without adequate pain control

Pain that worsens despite conventional treatment or that returns when treatment is stopped
Normal imaging results (MRI, X-ray) despite severe or persistent pain
Pain that significantly impairs your ability to work, exercise, or participate in daily activities
Progressive worsening over months despite adequate rest and standard pain management
Desire to understand the root cause of your pain rather than managing symptoms indefinitely

🚨 Seek Emergency Medical Evaluation Immediately if You Experience:

Sudden severe headache described as “the worst of your life” (possible subarachnoid haemorrhage)
Back or abdominal pain with fever and rigors (possible spinal epidural abscess or organ infection)
New-onset severe pain associated with unexplained weight loss (possible malignancy requiring urgent evaluation)
Chest pain radiating to the left arm or jaw (possible cardiac event)
Sudden weakness, numbness, or paralysis in any limb (possible spinal cord compression or stroke)
Pain following trauma with suspected fracture or internal organ injury

What Our Patients Say About Chronic Pain Treatment

The following testimonials represent the experiences of individual patients. Results vary. Names and identifying details are presented with patient consent using first name and last initial only.

"I had been told for four years that my pain was anxiety — that my blood tests were normal and I should exercise more. I came to Patients Medical after finding them online, frankly desperate. Dr. Gulati ran testing I had never had — an organic acid test, a salivary cortisol profile, and an inflammatory cytokine panel. Within two weeks I had a real explanation: severe magnesium deficiency, a blunted cortisol curve, and significant gut dysbiosis driving LPS-mediated inflammation. Six months into treatment I am 70% better. I still have bad days, but I understand why, and I have tools to manage them."

"The IV therapy made me a believer. I walked into my first magnesium infusion in a 7/10 pain flare and left at a 3/10. I thought it was coincidence. After the third infusion, I realised it was medicine. The team then built a full protocol around the infusions — LDN, diet changes, acupuncture — and I went from daily Tramadol use to none in about 14 weeks. My gastroenterologist was shocked. I wish I had found this approach five years ago, but I am grateful I found it now."

"What I found most valuable was the Pain Neuroscience Education component. I am a rational person — I needed to understand what was happening in my nervous system before I could trust the process. Once I understood central sensitisation and why my pain was real even when my MRI was normal, something shifted in my relationship to the pain itself. Combined with the gut restoration protocol (I had significant dysbiosis) and LDN, I have had the first pain-free months I can remember in seven years. The care at Patients Medical is genuinely different — thorough, collaborative, and aimed at resolution rather than management."

Explore Our Blog For More Insights

Frequently Asked Questions About Chronic Pain

Is chronic pain a real medical condition, or is it psychological?

Chronic pain is absolutely a real, physiological medical condition recognised by the International Association for the Study of Pain (IASP), the World Health Organization (WHO), and the American Medical Association. It is defined as pain lasting three months or longer beyond normal tissue healing, and it involves measurable, objective changes in the central nervous system — most notably a process called central sensitisation, in which dorsal horn neurons in the spinal cord and regions of the brain undergo neuroplastic changes that amplify pain signals even without ongoing injury.

These changes can be observed on functional MRI imaging and confirmed through biomarkers such as elevated substance P, inflammatory cytokines (IL-6, TNF-alpha), and altered cortisol patterning. The psychological component — depression, anxiety, catastrophising — is real and important, but it is a consequence of altered neurobiology, not its cause. Dismissing chronic pain as ‘all in the head’ is clinically inaccurate and delays effective treatment.

At Patients Medical, we treat chronic pain as the complex neurobiological condition it is, with testing that identifies the specific drivers in each patient. If you have been dismissed by previous physicians, we understand that experience, and we take a fundamentally different approach.

How long does chronic pain treatment take, and what does recovery look like?

Recovery from chronic pain is not linear, and honest timelines depend on how long the condition has been present, how many systems are involved, and how quickly underlying root causes respond to intervention. In our clinical experience at Patients Medical, most patients who engage fully with a personalised functional medicine protocol notice meaningful improvement in pain intensity and sleep quality within 6 to 12 weeks of beginning treatment.

Significant functional recovery — reduced reliance on analgesics, improved exercise tolerance, better cognitive clarity — typically develops over 3 to 6 months. For patients whose chronic pain has been present for many years and involves entrenched central sensitisation, a full protocol can take 12 to 18 months, with staged milestones. Recovery is tracked using validated tools including the Brief Pain Inventory (BPI), the Oswestry Disability Index, and sequential biomarker re-testing.

We do not promise a cure; we promise a systematic, evidence-informed effort to identify every modifiable driver and address it. Many patients achieve sustained remission; others achieve a level of pain that no longer dominates their life. The difference between these outcomes typically reflects the duration of the condition and the degree of adherence to the lifestyle components of the protocol.

What tests actually diagnose chronic pain and its root causes?

Standard medical testing rarely identifies the root causes of chronic pain because it focuses on imaging and tissue damage rather than the neurobiological and biochemical drivers of the condition. At Patients Medical, we use a layered diagnostic approach that measures what standard panels miss.

We begin with a high-sensitivity C-reactive protein (hs-CRP) and inflammatory cytokine panel (including IL-6, IL-1β, and TNF-alpha) to quantify the systemic inflammation fuelling pain amplification. We then assess comprehensive micronutrient status — RBC magnesium, vitamin D3 (25-OH-D3), B12 and methylmalonic acid, coenzyme Q10, and zinc — all of which are critical for nerve membrane stability and pain signalling regulation.

A salivary cortisol and DHEA-S adrenal stress index maps the HPA axis dysregulation driving poor sleep, immune suppression, and lowered pain thresholds. Organic acid testing (OAT) reveals mitochondrial dysfunction and neurotransmitter metabolites — including quinolinic acid, a direct biomarker of microglial NMDA receptor excitotoxicity and central sensitisation. Finally, comprehensive stool analysis with microbiome mapping identifies gut dysbiosis and intestinal permeability that drives LPS-mediated neuroinflammation. These five layers, combined with a detailed clinical history, allow us to construct a personalised root-cause map for each patient.

Can chronic pain cause weight gain?

Yes — chronic pain frequently contributes to weight gain through multiple intersecting mechanisms that are often overlooked. First, pain reduces physical activity, lowering caloric expenditure and causing progressive muscle loss (sarcopenia), which further slows basal metabolic rate. Even modest reductions in daily movement — from 8,000 steps to 3,000 steps — can produce measurable metabolic changes over months.

Second, the chronic stress of persistent pain dysregulates the HPA axis, producing elevated cortisol that promotes central (visceral) adipose deposition, increases appetite for calorie-dense foods, and drives insulin resistance independently of diet. Third, poor sleep — nearly universal in chronic pain — suppresses leptin (the satiety hormone) and elevates ghrelin (the hunger hormone), creating a biochemical drive toward overeating that operates below conscious awareness.

Fourth, many conventional pain medications — including tricyclic antidepressants (amitriptyline), gabapentinoids (pregabalin, gabapentin), and certain opioids — list weight gain as a direct side effect through mechanisms including increased appetite, fluid retention, and metabolic suppression. At Patients Medical, we address pain and metabolic health simultaneously, recognising that weight normalisation is both a consequence and a catalyst of pain recovery.

What is the difference between chronic pain and fibromyalgia?

Chronic pain is a broad diagnostic category describing any pain persisting beyond three months, encompassing conditions of diverse origin — nociceptive (tissue damage-driven), neuropathic (nerve injury-driven), and nociplastic (central sensitisation without clear peripheral pathology). Fibromyalgia is a specific chronic pain syndrome within the nociplastic category, characterised by widespread musculoskeletal pain affecting both sides of the body above and below the waist, diagnosed using the 2016 American College of Rheumatology (ACR) criteria, which require a Widespread Pain Index (WPI) score of seven or more and a Symptom Severity Scale (SSS) score of five or more, with symptoms present for at least three months.

In other words: fibromyalgia is one form of chronic pain, but not all chronic pain is fibromyalgia. What distinguishes fibromyalgia is the specific pattern of widespread tenderness, the severity of associated cognitive symptoms (fibro fog), the sleep disruption, and the absence of inflammatory markers on standard blood tests — which reflects its primarily nociplastic mechanism.

Both conditions involve central sensitisation, but fibromyalgia has a more defined diagnostic framework. At Patients Medical, we use the full spectrum of functional medicine testing to determine whether a patient has fibromyalgia, another specific chronic pain syndrome, or a combination — because the distinction shapes the treatment protocol. See our dedicated Fibromyalgia page for more information.

How does chronic pain affect the brain and mental health?

Chronic pain and mental health are bidirectionally linked at the neurological level — they are not simply co-occurring problems; they are the same dysregulated system expressing itself in two domains simultaneously. The prefrontal cortex, anterior cingulate cortex (ACC), amygdala, and insular cortex are all involved in both pain processing and emotional regulation. In chronic pain, the ACC becomes hyperactivated (amplifying the affective suffering component of pain), the prefrontal cortex shows reduced grey matter volume (impairing top-down pain inhibition), and the amygdala becomes sensitised to threat — maintaining a state of hypervigilance that perpetuates the pain cycle.

Simultaneously, chronic pain suppresses serotonin and dopamine synthesis and increases substance P and glutamate — creating the neurochemical substrate of depression and anxiety. Studies consistently find that 30–50% of chronic pain patients meet diagnostic criteria for major depressive disorder, and 20–35% for generalised anxiety disorder.

Importantly, treating depression alone rarely resolves chronic pain, and treating pain alone rarely resolves the depression — because they share the same underlying neurobiological mechanisms. Our approach targets both simultaneously, using nutritional support for neurotransmitter synthesis (B6, B12, methylfolate, tyrosine, tryptophan), HPA axis normalisation, and mind-body interventions proven to remodel pain-processing circuits over time.

What supplements and natural treatments support chronic pain recovery?

Several supplements have meaningful clinical evidence for chronic pain, particularly when deficiencies are confirmed through testing. Magnesium glycinate (400–600 mg daily) is foundational: magnesium acts as a natural NMDA receptor antagonist — blocking the channel through which glutamate drives central sensitisation — and deficiency is documented in the majority of chronic pain patients. Vitamin D3 (target serum 25-OH-D3 of 60–80 ng/mL) reduces pro-inflammatory cytokine signalling and supports immune regulation; deficiency correlates strongly with pain severity.

Palmitoylethanolamide (PEA) at 600–1200 mg daily is a naturally occurring fatty acid amide that reduces neuroinflammation via PPAR-alpha activation without psychoactivity — one of the most specific and well-tolerated nutraceuticals for central sensitisation. Alpha-lipoic acid (600 mg daily) reduces oxidative stress in peripheral nerve tissue and has evidence in neuropathic pain specifically. Coenzyme Q10 (300 mg daily) supports mitochondrial ATP production in pain-processing neurons and has shown benefit in fibromyalgia and migraine-associated chronic pain.

Low-dose naltrexone (LDN), at 1.5–4.5 mg nightly, bridges pharmacology and functional medicine: it blocks toll-like receptor 4 (TLR4) on microglial cells, reducing neuroinflammation, and triggers compensatory endorphin upregulation. It is available by prescription and is one of the most promising tools in our chronic pain protocol. All supplementation at Patients Medical is guided by baseline testing and monitored with follow-up labs — we do not prescribe supplements blindly.

Ready to Understand and Resolve Your Chronic Pain?

Patients Medical brings together functional medicine expertise, advanced biomarker testing, and personalised treatment protocols — so you can finally have answers that lead to real recovery, not just symptom management.

Call us at (212) 794-8800 · 800 Second Avenue, Suite 900, New York, NY 10017

Begin Your Journey with Patients Medical

Patients Medical specializes in gently helping the patient identify the root cause of their medical issues and then assist them to recover from their problems to help them move forward to good health.

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To schedule an in person on Tele-medicine appointment, please call our office at (212) 794-8800 or email us at info@PatientsMedical.com We look forward to hearing from you

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Patients Medical PC
1148 Fifth Avenue, Suite 1B New York, NY 10128

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