Chronic Pain: Types, Neuroscience, and a Complete Treatment Guide

If you have lived with pain for months or years, you already know that chronic pain is not just a physical sensation. It changes how you sleep, how you think, how you relate to your body, and how you move through daily life. You may have been told the pain is “in your head” or that imaging does not explain your symptoms. Neither of those statements helps, and both miss the point.

Chronic pain is a real, measurable neurobiological condition. It involves changes in how your nervous system processes signals, and those changes can persist long after the original injury has healed. Understanding what is actually happening in your body is the first step toward effective treatment.

This guide covers the science behind chronic pain, the major conditions it includes, how it is diagnosed, and the full range of treatment options available today, from medications and interventional procedures to regenerative therapies and integrative approaches.

What Makes Pain “Chronic”?

Acute pain is a warning signal. You touch a hot pan, your hand hurts, you pull it away. The pain has a clear cause, a protective purpose, and a predictable timeline. It resolves as the tissue heals.

Chronic pain is different. The International Association for the Study of Pain defines it as pain persisting or recurring for more than three months [1]. But the distinction is not just about duration. Chronic pain involves real changes in how your peripheral nerves, spinal cord, and brain process pain signals.

In many cases, the nervous system becomes sensitized. Neurons that transmit pain signals become hyperexcitable, firing more easily and more often. Pain pathways that should quiet down after healing instead stay active or even amplify. This is not imaginary. It shows up on functional MRI scans and in measurable changes to nerve conduction, neurotransmitter levels, and brain structure [2].

This means that chronic pain can persist even when there is no ongoing tissue damage. The alarm system itself has malfunctioned.

The Three Types of Chronic Pain

Nociceptive Pain

This is pain caused by actual or threatened damage to non-neural tissue. Your nociceptors (pain-sensing nerve endings in skin, muscles, joints, and organs) detect mechanical, thermal, or chemical stimuli and send signals up to your brain. Osteoarthritis, inflammatory conditions, and many forms of musculoskeletal pain fall into this category.

Nociceptive pain generally correlates with identifiable tissue pathology. It tends to respond to anti-inflammatory medications, physical therapy, and structural interventions.

Neuropathic Pain

Neuropathic pain results from damage or disease affecting the somatosensory nervous system. The nerves themselves are injured or dysfunctional. Common examples include diabetic neuropathy, postherpetic neuralgia (pain after shingles), trigeminal neuralgia, and radiculopathy from a herniated disc compressing a nerve root [3].

Patients often describe neuropathic pain as burning, shooting, electric, or tingling. It can include allodynia (pain from stimuli that should not hurt, like a light touch) and hyperalgesia (exaggerated pain from mildly painful stimuli). Neuropathic pain tends to respond poorly to standard painkillers like NSAIDs and often requires medications that target nerve signaling, such as gabapentinoids or certain antidepressants.

Nociplastic Pain (Central Sensitization)

This is the most recently recognized category, and it is arguably the most misunderstood. Nociplastic pain arises from altered nociception, meaning the pain processing system itself is dysfunctional, without clear evidence of tissue damage or nerve injury [4].

Fibromyalgia is the most well-known nociplastic condition. The brain and spinal cord amplify pain signals, lower pain thresholds, and create widespread pain sensitivity. Imaging studies show altered connectivity in pain-processing brain regions and changes in descending pain inhibition pathways [5].

Nociplastic pain is not “just psychological,” but psychological factors like stress, trauma history, and catastrophizing can influence the degree of central sensitization. This is why treatment for nociplastic pain often includes psychological and neuroscience-based approaches alongside physical treatments.

Common Chronic Pain Conditions

Fibromyalgia

Fibromyalgia affects an estimated 2 to 4 percent of the population and is characterized by widespread musculoskeletal pain, fatigue, sleep disturbance, and cognitive difficulties (“fibro fog”). It is a prototypical central sensitization condition. Diagnosis is clinical, based on symptom criteria rather than lab tests or imaging [5].

Treatment typically combines medication (duloxetine, milnacipran, pregabalin), aerobic exercise, sleep optimization, and cognitive behavioral therapy. Many patients also benefit from pain neuroscience education and graded exercise programs.

Chronic Low Back Pain

Low back pain is the leading cause of disability worldwide [6]. While acute back pain usually resolves within weeks, about 20 percent of cases become chronic. The relationship between imaging findings and pain is often weak. Many people with herniated discs on MRI have no pain, while many people with severe back pain have unremarkable imaging.

This disconnect points to the role of central sensitization, deconditioning, fear-avoidance behavior, and psychosocial factors in chronic back pain. Evidence strongly supports exercise, physical therapy, and psychological approaches over passive treatments or surgery for most cases of nonspecific chronic low back pain [7].

Complex Regional Pain Syndrome (CRPS)

CRPS typically develops after an injury (often to a limb) and involves pain that is disproportionate to the original trauma, along with swelling, skin color and temperature changes, and motor dysfunction. It involves both peripheral and central sensitization and can be extremely disabling. Early aggressive treatment with physical therapy, nerve blocks, and sometimes ketamine or spinal cord stimulation offers the best outcomes [8].

Peripheral Neuropathy

Damage to peripheral nerves from diabetes, chemotherapy, alcohol use, autoimmune conditions, or other causes can produce chronic burning, tingling, numbness, and pain, most commonly in the hands and feet. Management focuses on treating the underlying cause when possible, controlling symptoms with medications like gabapentin, pregabalin, or duloxetine, and preventing further nerve damage [3].

Chronic Headache Disorders

Migraine and tension-type headaches become chronic when they occur 15 or more days per month. Chronic migraine affects about 2 percent of the general population and involves central sensitization of trigeminal pathways. Treatment includes preventive medications (beta-blockers, topiramate, CGRP monoclonal antibodies), acute medications, lifestyle modifications, and neuromodulation devices [9].

Pain Neuroscience: How Your Nervous System Creates Chronic Pain

Peripheral Sensitization

After tissue injury, inflammatory mediators (prostaglandins, bradykinin, cytokines) lower the activation threshold of nociceptors at the injury site. This is why an injured area becomes more sensitive to touch and pressure. In acute pain, this resolves as inflammation subsides. In chronic pain, peripheral sensitization can persist due to ongoing low-grade inflammation or nerve damage.

Central Sensitization

Central sensitization is the amplification of neural signaling within the central nervous system that causes pain hypersensitivity. Neurons in the dorsal horn of the spinal cord become hyperexcitable. NMDA receptors are upregulated. Descending inhibitory pathways from the brainstem (which normally dampen pain signals) become less effective [2].

The result is that normal sensory input gets interpreted as painful (allodynia), mildly painful input becomes severely painful (hyperalgesia), and pain spreads beyond the original injury site. Central sensitization is a key mechanism in fibromyalgia, chronic tension-type headache, irritable bowel syndrome, and many other chronic pain conditions.

Neuroplasticity and Pain

The brain physically reorganizes in response to chronic pain. Functional MRI studies show altered activation patterns, changes in gray matter volume, and disrupted connectivity in regions involved in pain processing, emotional regulation, and cognition [10]. The good news is that neuroplasticity works both ways. Effective treatment can reverse some of these brain changes, which is part of why multidisciplinary pain programs that combine physical, psychological, and educational approaches show lasting benefits.

Pain Catastrophizing

Pain catastrophizing is a cognitive pattern characterized by rumination about pain, magnification of pain-related threats, and helplessness. It is one of the strongest psychological predictors of chronic pain outcomes, more predictive than tissue pathology in many studies [11]. This is not about blaming the patient. Catastrophizing is a measurable cognitive process that amplifies central sensitization. Interventions like cognitive behavioral therapy directly target it and produce measurable reductions in both catastrophizing and pain intensity.

Diagnosis and Assessment

Diagnosing chronic pain involves more than identifying a structural cause. A thorough assessment includes:

• Pain history: location, duration, quality (aching, burning, sharp, shooting), aggravating and relieving factors, temporal pattern
• Functional impact: how pain affects sleep, work, movement, mood, and daily activities
• Psychological screening: depression, anxiety, catastrophizing, trauma history, sleep quality
• Physical examination: neurological testing, range of motion, provocative tests, assessment of central sensitization signs (allodynia, widespread hyperalgesia)
• Imaging and labs: MRI, X-ray, nerve conduction studies, blood work as appropriate, keeping in mind that imaging findings often do not correlate with pain severity
• Validated pain scales: numeric rating scale, Brief Pain Inventory, Central Sensitization Inventory, Pain Catastrophizing Scale

The goal is to classify the pain mechanism (nociceptive, neuropathic, nociplastic, or mixed), identify treatable contributing factors, and build a treatment plan that addresses all dimensions of the pain experience.

Conventional Treatments

Non-Opioid Medications

NSAIDs (ibuprofen, naproxen, celecoxib) reduce inflammation and are most effective for nociceptive pain with an inflammatory component. Long-term use carries risks of GI bleeding, cardiovascular events, and kidney damage. They are generally first-line for conditions like osteoarthritis and inflammatory musculoskeletal pain [12].

Acetaminophen provides mild analgesic effects with a better GI safety profile than NSAIDs but limited anti-inflammatory activity. Its efficacy for chronic pain conditions like low back pain has been questioned by recent evidence [7].

Antidepressants for pain: SNRIs (duloxetine, venlafaxine) and tricyclic antidepressants (amitriptyline, nortriptyline) modulate descending pain inhibition pathways and are effective for neuropathic pain, fibromyalgia, and chronic headache. Their pain-relieving effect is independent of their antidepressant action and occurs at lower doses [3].

Gabapentinoids (gabapentin, pregabalin) bind to calcium channels in the nervous system and reduce excitatory neurotransmitter release. They are first-line for neuropathic pain and approved for fibromyalgia (pregabalin). Side effects include drowsiness, dizziness, and weight gain. There is also growing concern about misuse potential [3].

Opioids: The Shift Away

Opioids were widely prescribed for chronic pain through the late 1990s and 2000s. The consequences of that prescribing pattern are well documented: addiction, overdose deaths, hyperalgesia (opioids paradoxically increasing pain sensitivity with long-term use), and modest long-term efficacy at best [13].

Current guidelines from the CDC, VA/DoD, and major pain societies recommend opioids only when non-opioid therapies have been tried and failed, at the lowest effective dose, with regular reassessment, and with clear functional goals. For most chronic non-cancer pain, the risks of long-term opioid therapy outweigh the benefits [13].

This does not mean opioids are never appropriate. Some patients with severe chronic pain do benefit from carefully managed opioid therapy. But the emphasis has shifted toward multimodal approaches that address pain through multiple mechanisms rather than relying on a single drug class.

Interventional Approaches

Nerve Blocks

Nerve blocks involve injecting local anesthetic (sometimes with corticosteroid) near specific nerves or nerve clusters. They serve both diagnostic and therapeutic purposes. If blocking a specific nerve eliminates the pain, that confirms the pain source. Epidural steroid injections, facet joint blocks, and peripheral nerve blocks are among the most common. Effects are typically temporary (weeks to months) but can be repeated [14].

Radiofrequency Ablation (RFA)

RFA uses heat generated by radio waves to create a lesion on a nerve, disrupting its ability to transmit pain signals. It is most commonly used for facet joint pain in the spine and sacroiliac joint pain. Pain relief typically lasts 6 to 12 months before the nerve regenerates. Cooled radiofrequency and pulsed radiofrequency are variations that may offer advantages for certain pain types [14].

Spinal Cord Stimulation (SCS)

SCS involves implanting electrodes along the spinal cord that deliver electrical pulses to modulate pain signaling. It is FDA-approved for chronic neuropathic pain, failed back surgery syndrome, and CRPS. Newer high-frequency (10 kHz) and burst stimulation patterns have improved outcomes compared to older tonic stimulation [8]. Patients typically undergo a trial period before permanent implantation.

Ketamine Infusions

Ketamine is an NMDA receptor antagonist that can “reset” central sensitization. Subanesthetic IV ketamine infusions (typically 0.5 mg/kg over 40 minutes, or longer infusions over several hours) have shown benefit for CRPS, fibromyalgia, neuropathic pain, and treatment-resistant depression that accompanies chronic pain. The FDA has approved esketamine (nasal spray) for treatment-resistant depression, but IV ketamine for chronic pain remains off-label [15].

Transcranial Magnetic Stimulation (TMS)

Repetitive TMS applies magnetic pulses to specific brain regions to modulate neural activity. When targeted to the motor cortex or dorsolateral prefrontal cortex, it can reduce chronic pain through top-down modulation of pain processing circuits. Evidence is strongest for neuropathic pain and fibromyalgia, though response varies [16].

Regenerative Options for Structural Pain

When chronic pain has a clear structural component (damaged tendons, ligaments, cartilage, or joints), regenerative medicine approaches aim to promote tissue repair rather than just blocking pain signals.

Platelet-Rich Plasma (PRP)

PRP concentrates growth factors from your own blood and injects them into damaged tissue. Evidence is strongest for knee osteoarthritis, lateral epicondylitis (tennis elbow), and plantar fasciitis. For knee OA, a 2019 meta-analysis in the American Journal of Sports Medicine found PRP provided greater pain reduction than hyaluronic acid or saline at 12 months [17].

Mesenchymal Stem Cell Therapy

Stem cell injections (typically using mesenchymal stem cells from bone marrow or adipose tissue) are being investigated for joint degeneration, disc disease, and tendon injuries. Early clinical data is promising for knee osteoarthritis, but large randomized trials are still needed. This field is evolving rapidly, and patients should be cautious of clinics making claims that outpace the evidence [17].

Prolotherapy

Prolotherapy involves injecting a dextrose (sugar water) solution into damaged ligaments or tendons to trigger a localized inflammatory response that stimulates repair. It has the longest track record of the regenerative injectables and moderate evidence supporting its use for chronic low back pain, knee osteoarthritis, and lateral epicondylitis [17].

Regenerative therapies are most appropriate when there is identifiable structural pathology contributing to pain. They are not a substitute for addressing central sensitization, movement patterns, and psychological factors in patients with nociplastic or mixed pain presentations.

Integrative and Behavioral Approaches

Pain Neuroscience Education (PNE)

PNE teaches patients about the neurobiology of pain, including how the nervous system becomes sensitized, why pain does not always equal tissue damage, and how the brain constructs the pain experience. Multiple randomized trials show that PNE reduces pain catastrophizing, fear of movement, and disability, and improves outcomes when combined with exercise and manual therapy [18].

Understanding that your pain is real but that it reflects nervous system sensitization rather than ongoing tissue destruction can fundamentally change how you relate to pain and how you approach rehabilitation.

Graded Exposure and Graded Activity

Many people with chronic pain develop fear-avoidance behavior: they stop moving because they fear that activity will cause more damage. This leads to deconditioning, which increases pain sensitivity and disability in a vicious cycle.

Graded exposure gradually reintroduces feared movements and activities in a safe, structured way. Graded activity systematically increases physical activity levels based on time-based rather than pain-based pacing. Both approaches have strong evidence for chronic low back pain and other musculoskeletal pain conditions [18].

Cognitive Behavioral Therapy (CBT) for Pain

CBT for chronic pain targets the thoughts, beliefs, and behaviors that amplify pain and disability. It addresses catastrophizing, helplessness, fear-avoidance, and maladaptive coping strategies. CBT is one of the most well-studied psychological interventions for chronic pain, with consistent evidence showing reductions in pain intensity, disability, and psychological distress [11].

Acceptance and Commitment Therapy (ACT)

ACT takes a different approach from CBT. Rather than trying to change pain-related thoughts, ACT focuses on accepting pain as part of present experience while committing to actions aligned with personal values. It emphasizes psychological flexibility: being willing to experience pain without letting it dictate behavior. ACT has growing evidence for chronic pain, particularly for improving function and quality of life [11].

Biofeedback

Biofeedback uses real-time monitoring of physiological signals (muscle tension, heart rate variability, skin conductance, brain waves) to help patients learn to regulate these processes. It is especially useful for tension-type headaches, TMJ pain, and conditions with a significant muscle tension component. Neurofeedback, a form of biofeedback targeting brainwave patterns, is being investigated for broader chronic pain applications.

Acupuncture

Acupuncture involves inserting thin needles at specific points on the body. A 2018 individual patient data meta-analysis in the Journal of Pain (Vickers et al.) found that acupuncture was superior to sham acupuncture and no-acupuncture controls for chronic musculoskeletal pain, headache, and osteoarthritis, with effects persisting at 12 months [19]. It appears to work through multiple mechanisms including endorphin release, modulation of inflammatory mediators, and effects on connective tissue.

Meditation and Mindfulness-Based Stress Reduction (MBSR)

MBSR, developed by Jon Kabat-Zinn specifically for chronic pain patients, is an 8-week program combining mindfulness meditation, body scanning, and gentle yoga. Research shows it reduces pain intensity, improves function, and decreases psychological distress. Neuroimaging studies demonstrate that mindfulness practice alters activity in pain-processing brain regions and strengthens prefrontal cortical control over pain perception [20].

Exercise

Exercise is the single most broadly supported intervention for chronic pain across conditions. Aerobic exercise, resistance training, yoga, tai chi, aquatic therapy, and walking programs all show benefit. Exercise reduces central sensitization, improves mood, restores function, and triggers endogenous opioid and endocannabinoid release [7].

The key is starting at a level you can tolerate and progressing gradually. Exercise should be guided by time and function goals, not by pain levels. Some increase in pain during the early stages of an exercise program is normal and does not indicate harm.

Chronic Pain and Mental Health

Chronic pain and mental health conditions share neurobiology. The brain regions involved in processing pain overlap significantly with those involved in mood regulation, and the neurotransmitters involved (serotonin, norepinephrine, dopamine) are the same ones targeted by antidepressants.

Depression occurs in 30 to 50 percent of chronic pain patients. Anxiety is similarly common. Sleep disturbance affects the majority. These are not separate problems. Depression amplifies pain perception, poor sleep lowers pain thresholds, and anxiety drives hypervigilance and catastrophizing [11].

Effective chronic pain treatment must address mental health directly. This means screening for depression and anxiety, offering evidence-based psychological treatments, optimizing sleep, and integrating behavioral health into the pain management plan rather than treating pain and mental health in separate silos.

Opioid Alternatives: Building a Modern Pain Plan

The move away from opioid-centered treatment has created space for more effective multimodal approaches. Evidence-supported opioid alternatives include:

• Non-opioid medications: NSAIDs, duloxetine, gabapentinoids, low-dose naltrexone (LDN), topical analgesics (lidocaine patches, capsaicin, diclofenac gel)
• Interventional procedures: nerve blocks, RFA, SCS, ketamine infusions
• Physical rehabilitation: physical therapy, exercise programs, aquatic therapy
• Psychological therapies: CBT, ACT, biofeedback, MBSR
• Regenerative medicine: PRP, prolotherapy for appropriate structural conditions
• Complementary approaches: acupuncture, yoga, tai chi
• Neuromodulation: TMS, transcutaneous electrical nerve stimulation (TENS)

Low-dose naltrexone (LDN) deserves special mention. At doses of 1 to 5 mg (far below the 50 mg dose used for addiction), naltrexone appears to reduce neuroinflammation and glial cell activation. Small trials show promise for fibromyalgia, CRPS, and other central sensitization conditions, though large-scale trials are still needed [21].

Building a Multidisciplinary Pain Management Plan

The most effective approach to chronic pain is not any single treatment. It is a coordinated, multidisciplinary plan that addresses the biological, psychological, and social dimensions of pain.

A strong pain management plan typically includes:

1. Accurate pain classification: Determine whether pain is primarily nociceptive, neuropathic, nociplastic, or mixed. This guides treatment selection.
2. Education: Understand your pain neuroscience. Know that chronic pain reflects nervous system changes, not necessarily ongoing damage.
3. Movement: Start a structured exercise program. This is non-negotiable for almost every chronic pain patient. Work with a physical therapist who understands pain science.
4. Psychological support: Engage with CBT, ACT, or another evidence-based psychological approach. Address catastrophizing, fear-avoidance, depression, and sleep.
5. Medications (targeted): Use non-opioid medications matched to your pain mechanism. SNRIs for nociplastic or neuropathic pain, NSAIDs for inflammatory nociceptive pain, gabapentinoids for neuropathic pain.
6. Interventional procedures (when indicated): Nerve blocks, RFA, or neuromodulation for specific, identifiable pain generators.
7. Regenerative therapies (when appropriate): PRP or prolotherapy for structural problems contributing to pain.
8. Integrative therapies: Acupuncture, mindfulness, or biofeedback as adjuncts based on your preferences and response.
9. Self-management: Develop pacing strategies, stress management practices, and a long-term plan you can sustain independently.

The team may include a pain medicine physician, physical therapist, psychologist, and primary care provider. Communication between providers is critical. The best outcomes come from interdisciplinary pain rehabilitation programs where these providers work together rather than in isolation [22].

Chronic pain treatment is not about eliminating pain entirely. For many patients, that is not a realistic goal. It is about reducing pain to manageable levels, restoring function, improving quality of life, and building skills to manage flare-ups when they occur.

Related Reading

• Fibromyalgia: Causes, Symptoms, and Treatment Options
• Low-Dose Naltrexone (LDN): Uses, Dosing, and Evidence
• PRP Therapy: What the Evidence Says
• Ketamine Therapy: A Complete Guide
• Anti-Aging Supplements Guide

Frequently Asked Questions

What counts as chronic pain?

The guide defines chronic pain as pain lasting 3 or more months. It notes that the distinction is not just about duration but involves real changes in how the body and nervous system process pain.

Does regenerative therapy like PRP or stem cells work for chronic pain?

The evidence is mixed and still developing. For knee osteoarthritis, the guide cites a 2019 meta-analysis in the American Journal of Sports Medicine finding that PRP provided greater pain reduction than hyaluronic acid or saline at 12 months. For mesenchymal stem cell therapy, early clinical data is described as promising, though large-scale randomized trials are still needed, and patients should be cautious of clinics making claims that outpace the evidence.

Which approaches have the strongest evidence?

Exercise is described as the single most broadly supported intervention for chronic pain across conditions, and CBT is called one of the most well-studied psychological interventions. Multiple randomized trials show pain neuroscience education reduces pain catastrophizing, fear of movement, and disability, and acupuncture showed superiority for chronic musculoskeletal pain, headache, and osteoarthritis with effects persisting at 12 months.

What are the side effects of common pain medications?

Long-term NSAID use carries risks of GI bleeding, cardiovascular events, and kidney damage. Gabapentinoids can cause drowsiness, dizziness, and weight gain, with growing concern about misuse potential. Opioids carry risks of addiction, overdose deaths, and hyperalgesia, where long-term use paradoxically increases pain sensitivity, with modest long-term efficacy at best.

How long do interventional treatments last?

The guide notes that nerve block effects are typically temporary, lasting weeks to months. Radiofrequency ablation relief typically lasts 6 to 12 months before the nerve regenerates. The MBSR option is delivered as an 8-week program.

Are these treatments FDA-approved?

It varies by treatment. Spinal cord stimulation is FDA-approved for chronic neuropathic pain, failed back surgery syndrome, and CRPS. Ketamine infusions for chronic pain are used off-label, though the FDA has approved esketamine nasal spray for treatment-resistant depression. For stem cell therapy, the guide states that large randomized trials are still needed.

References

[1] Treede RD, Rief W, Barke A, et al. Chronic pain as a symptom or a disease: the IASP Classification of Chronic Pain for the International Classification of Diseases (ICD-11). Pain. 2019;160(1):19-27. doi:10.1097/j.pain.0000000000001384

[2] Woolf CJ. Central sensitization: implications for the diagnosis and treatment of pain. Pain. 2011;152(3 Suppl):S2-S15. doi:10.1016/j.pain.2010.09.030

[3] Finnerup NB, Attal N, Haroutounian S, et al. Pharmacotherapy for neuropathic pain in adults: a systematic review and meta-analysis. Lancet Neurol. 2015;14(2):162-173. doi:10.1016/S1474-4422(14)70251-0

[4] Kosek E, Cohen M, Baron R, et al. Do we need a third mechanistic descriptor for chronic pain states? Pain. 2016;157(7):1382-1386. doi:10.1097/j.pain.0000000000000507

[5] Clauw DJ. Fibromyalgia: a clinical review. JAMA. 2014;311(15):1547-1555. doi:10.1001/jama.2014.3266

[6] GBD 2017 Disease and Injury Incidence and Prevalence Collaborators. Global, regional, and national incidence, prevalence, and years lived with disability for 354 diseases and injuries. Lancet. 2018;392(10159):1789-1858. doi:10.1016/S0140-6736(18)32279-7

[7] Foster NE, Anema JR, Cherkin D, et al. Prevention and treatment of low back pain: evidence, challenges, and promising directions. Lancet. 2018;391(10137):2368-2383. doi:10.1016/S0140-6736(18)30489-6

[8] Harden RN, McCabe CS, Goebel A, et al. Complex regional pain syndrome: practical diagnostic and treatment guidelines, 5th edition. Pain Med. 2022;23(Suppl 1):S1-S53. doi:10.1093/pm/pnac046

[9] Dodick DW. Migraine. Lancet. 2018;391(10127):1315-1330. doi:10.1016/S0140-6736(18)30478-1

[10] Apkarian AV, Hashmi JA, Baliki MN. Pain and the brain: specificity and plasticity of the brain in clinical chronic pain. Pain. 2011;152(3 Suppl):S49-S64. doi:10.1016/j.pain.2010.11.010

[11] Williams ACC, Fisher E, Hearn L, Eccleston C. Psychological therapies for the management of chronic pain (excluding headache) in adults. Cochrane Database Syst Rev. 2020;8:CD007407. doi:10.1002/14651858.CD007407.pub4

[12] Enthoven WTM, Roelofs PDDM, Deyo RA, van Tulder MW, Koes BW. Non-steroidal anti-inflammatory drugs for chronic low back pain. Cochrane Database Syst Rev. 2016;2:CD012087. doi:10.1002/14651858.CD012087

[13] Dowell D, Ragan KR, Jones CM, Baldwin GT, Chou R. CDC clinical practice guideline for prescribing opioids for pain, United States, 2022. MMWR Recomm Rep. 2022;71(3):1-95. doi:10.15585/mmwr.rr7103a1

[14] Cohen SP, Vase L, Hooten WM. Chronic pain: an update on burden, best practices, and new advances. Lancet. 2021;397(10289):2082-2097. doi:10.1016/S0140-6736(21)00393-7

[15] Orhurhu V, Orhurhu MS, Bhatia A, Cohen SP. Ketamine infusions for chronic pain: a systematic review and meta-analysis of randomized controlled trials. Anesth Analg. 2019;129(1):241-254. doi:10.1213/ANE.0000000000004185

[16] Lefaucheur JP, Aleman A, Baeken C, et al. Evidence-based guidelines on the therapeutic use of repetitive transcranial magnetic stimulation (rTMS): an update (2014-2018). Clin Neurophysiol. 2020;131(2):474-528. doi:10.1016/j.clinph.2019.11.002

[17] Defined Health. Regenerative medicine for musculoskeletal conditions. Defined Health Regenerative Medicine reports. Also: Dai WL, Zhou AG, Zhang H, Zhang J. Efficacy of platelet-rich plasma in the treatment of knee osteoarthritis: a meta-analysis. Am J Sports Med. 2017;45(3):NP1-NP2. doi:10.1177/0363546516677547

[18] Louw A, Zimney K, Puentedura EJ, Diener I. The efficacy of pain neuroscience education on musculoskeletal pain: a systematic review. Physiother Theory Pract. 2016;32(5):332-355. doi:10.1080/09593985.2016.1194646

[19] Vickers AJ, Vertosick EA, Lewith G, et al. Acupuncture for chronic pain: update of an individual patient data meta-analysis. J Pain. 2018;19(5):455-474. doi:10.1016/j.jpain.2017.11.005

[20] Cherkin DC, Sherman KJ, Balderson BH, et al. Effect of mindfulness-based stress reduction vs cognitive behavioral therapy or usual care on back pain and functional limitations in adults with chronic low back pain: a randomized clinical trial. JAMA. 2016;315(12):1240-1249. doi:10.1001/jama.2016.2323

[21] Younger J, Parkitny L, McLain D. The use of low-dose naltrexone (LDN) as a novel anti-inflammatory treatment for chronic pain. Clin Rheumatol. 2014;33(4):451-459. doi:10.1007/s10067-014-2517-2

[22] Kamper SJ, Apeldoorn AT, Chiarotto A, et al. Multidisciplinary biopsychosocial rehabilitation for chronic low back pain: Cochrane systematic review and meta-analysis. BMJ. 2015;350:h444. doi:10.1136/bmj.h444