Reading time: 4 minutes | Last updated: July 2026 | Brain fog friendly
Long Covid Pain is real, measurable, and biological. It is not a consequence of anxiety. It is not your body imagining things. It is the result of a nervous system that has been fundamentally altered by SARS-CoV-2 one that now processes pain signals differently, amplifies them beyond what the original input warrants, and cannot switch them off in the normal way. One of the most frustrating aspects of Long COVID pain is that it often moves. One day it may be your muscles, the next your joints, your chest, your skin or your head. This unpredictability can make people wonder whether several different problems are developing at once. In reality, many of these symptoms can be explained by changes in how the nervous system processes pain and sensory information rather than by repeated injury to different parts of the body.
This guide explains what central sensitisation is, why Long Covid pain feels so different from ordinary pain, how it connects to fibromyalgia and ME/CFS, and what actually helps.
Jump to: Types of pain | Central sensitisation | Fibromyalgia overlap | Headaches | Nerve pain | What helps | FAQs
The Types of Pain in Long Covid
Long Covid pain is not one thing. It is several distinct pain experiences that can occur separately or simultaneously.
Widespread musculoskeletal pain — aching muscles and joints across the whole body, not localised to one area. Often worse after exertion. Frequently described as feeling like a permanent low-grade flu body ache that never fully resolves.
Headaches — persistent, often daily, and different in character from headaches you had before. Can be pressure-like, throbbing, or located in specific regions. Frequently worsened by cognitive effort, screen time, and noise.
Nerve pain — burning, tingling, electric shock sensations, numbness, or hypersensitivity in limbs, skin, or face. Often related to small fibre neuropathy damage to the smallest nerve fibres which is now confirmed in a significant proportion of Long Covid patients.
Chest pain and tightness — not always cardiac in origin. Can reflect autonomic dysregulation, costochondritis (inflammation of rib cartilage), or musculoskeletal tightness from altered breathing patterns.
Allodynia — pain from things that should not hurt. Light touch, gentle pressure, clothing on skin, or a mild temperature change producing a pain response. This is a hallmark of central sensitisation and is one of the most disorienting aspects of Long Covid pain.
Sensory hypersensitivity — increased sensitivity to light, sound, and environmental stimuli. While not always described as pain, many patients experience these inputs as physically uncomfortable or painful. This reflects the same central sensitisation process affecting sensory processing beyond traditional pain pathways.
Central Sensitisation: The Nervous System Stuck on Amplify
This is the most important concept for understanding Long Covid pain and the one most patients have never been told about.
Normally, the nervous system processes pain signals proportionately. You injure tissue, pain signals travel to the brain, the brain registers pain, healing occurs, signals reduce. The system responds, then returns to baseline.
In central sensitisation, the central nervous system the brain and spinal cord becomes hypersensitised. The volume dial on pain processing is turned up and stays up. Signals that previously registered as minor or neutral now register as painful. This does not only apply to physical pain. The same amplification affects sensory input more broadly. Sounds may feel intrusive or even painful, light may become difficult to tolerate, and environments that were previously neutral can feel overwhelming. This is not psychological sensitivity. It reflects a lowered threshold across the nervous system’s processing of all incoming signals.The threshold drops. The intensity of pain increases beyond what the physical input warrants. And crucially, the system does not return to baseline because the sensitisation itself has become self-sustaining.
A June 2025 Expert Review of Neurotherapeutics study confirmed central sensitisation as the unifying biological framework across Long Covid, fibromyalgia, and ME/CFS with pain, fatigue, headaches, and cognitive symptoms all expressions of the same sensitised nervous system rather than separate problems occurring simultaneously.
What drives central sensitisation in Long Covid specifically:
Neuroinflammation — inflammatory cytokines activate glial cells (the brain’s immune cells), which in turn amplify pain signalling in the spinal cord and brain. A 2025 fibromyalgia update confirmed disrupted connectivity in the periaqueductal grey matter the brain region that normally suppresses pain signals from ascending meaning the descending pain inhibition system is impaired. Pain signals get amplified on the way up and are not being damped down on the way down.
Small fibre neuropathy — damage to the smallest peripheral nerve fibres sends abnormal signals into the central nervous system, providing the persistent peripheral input that sustains central sensitisation over time.
Autonomic dysregulation — the sympathetic nervous system’s persistent overactivity maintains a state of physiological stress that lowers pain thresholds and sustains sensitisation.
Sleep deprivation — non-restorative sleep directly worsens central sensitisation. The glymphatic system that clears inflammatory waste from the brain during deep sleep cannot function properly, allowing pain-amplifying inflammatory molecules to accumulate.
The Fibromyalgia Overlap — and Why It Matters
Fibromyalgia is not a separate condition you caught alongside Long Covid. For many patients, it is Long Covid expressing itself through the pain system.
Fibromyalgia is defined by widespread pain, fatigue, non-restorative sleep, and cognitive dysfunction — all driven by central sensitisation. The biological overlap with Long Covid is now extensively documented. Both show glial activation, disrupted descending pain inhibition, similar immune profiles, and post-exertional worsening of all symptoms.
A significant proportion of Long Covid patients estimates range from 30 to 40% in some cohorts meet the diagnostic criteria for fibromyalgia. This is not because they have developed two separate conditions. It is because Long Covid has sensitised the central nervous system in exactly the way that fibromyalgia describes.
If you have been given a fibromyalgia diagnosis since your Covid infection, it is almost certainly connected. And it means that management approaches developed for fibromyalgia particularly those targeting central sensitisation directly are relevant to your Long Covid pain.
The same applies to ME/CFS. Once Long Covid is considered in patients without well-defined organ disease, it fits best as a model of central sensitisation a single syndrome rather than many distinct diseases. Understanding this changes what treatment approaches make sense.
Pain Is More Than Just Pain
Many people notice that pain flares occur alongside worsening fatigue, brain fog and post-exertional malaise. This is not a coincidence. The same biological processes that increase pain sensitivity also affect energy production, cognitive function and sensory processing.
Rather than thinking of pain as an isolated symptom, it is often more helpful to see it as one expression of a nervous system that has become hypersensitive. This helps explain why reducing overall symptom burden through pacing, improving sleep and managing autonomic dysfunction can reduce pain even though they are not traditional pain treatments.
Headaches in Long Covid
Long Covid headaches are among the most consistently reported symptoms and among the least addressed clinically.
They differ from ordinary tension or migraine headaches in several ways: they are often daily or near-daily rather than episodic, they are worsened by cognitive effort and screen time in a way that mirrors brain fog, they frequently improve with lying down (suggesting a vascular or pressure component), and they often coexist with marked light and sound sensitivity, reflecting broader sensory amplification within the central nervous system
Central sensitisation drives a lowered threshold for headache triggers. Autonomic dysregulation impairs the vascular regulation of blood flow to and within the brain contributing to the pressure and pulsing quality many people describe. Neuroinflammation in the trigeminal pathways directly generates headache pain. And the hypoperfusion identified in Long Covid brain fog reduced cerebral blood flow contributes to headache in upright positions in many patients.
Standard headache management pain relief medication is often ineffective for Long Covid headaches and risks medication overuse headache with frequent use. Identifying and addressing the underlying drivers (autonomic dysfunction, sleep disruption, neuroinflammation) is more likely to reduce headache burden than symptomatic pain relief alone.
Nerve Pain and Small Fibre Neuropathy
Burning, tingling, electric shock sensations, and areas of numbness or hypersensitivity are not imagined. They reflect measurable damage to the smallest nerve fibres in the body.
Small fibre neuropathy (SFN) has been confirmed in a significant proportion of Long Covid patients through skin punch biopsy a simple test that counts the density of small nerve fibres in the skin. Reduced fibre density confirms nerve damage. This is objective, measurable, and independent of reported symptoms.
SFN in Long Covid is thought to be driven by autoimmune attack on small nerve fibres, direct viral damage, or microclot-related impairment of blood supply to peripheral nerves. It explains burning pain in the feet, hands, and face, temperature sensitivity, and the hypersensitivity to touch that characterises allodynia.
SFN is rarely tested for in routine clinical care because the biopsy is a specialist investigation. If you have these specific symptoms burning rather than aching, electric shock sensations, clear areas of altered skin sensation — it is worth asking specifically about SFN assessment through a neurology referral.
What Actually Helps
Addressing the drivers of Long Covid pain rather than just the symptoms is the most effective approach for central sensitisation-driven pain. Standard painkillers paracetamol, ibuprofen, opioids work on peripheral pain signals. They have limited effect on centrally sensitised pain because the problem is in the processing, not the tissue.
Sleep quality — the single most impactful intervention for central sensitisation. Poor sleep directly worsens pain sensitivity. Improving sleep architecture reduces the inflammatory burden that sustains sensitisation. This is not just comfort. It is mechanistically the most important modifiable factor for pain in Long Covid.
Pacing — post-exertional worsening of pain is central sensitisation amplifying the immune and neurological response to exertion. Staying within your energy envelope reduces the flares that reset and worsen sensitisation over time.
Low-dose naltrexone (LDN) — has shown early promise for central sensitisation-driven pain across fibromyalgia and Long Covid. It appears to modulate glial cell activation directly targeting the neuroinflammatory driver of sensitisation. Off-label and not universally available but worth discussing with your GP if pain is a dominant feature.
Medications targeting central sensitisation — amitriptyline and duloxetine are used in fibromyalgia for central sensitisation-driven pain and may be relevant in Long Covid where pain is the dominant phenotype. These are not standard pain medications they target the central nervous system processing of pain rather than peripheral nociception. Specialist input is appropriate.
Gentle movement within tolerance — complete immobility worsens sensitisation over time. Very gentle, symptom-paced movement that stays well within your PEM threshold can help prevent the progressive lowering of pain thresholds that comes with deconditioning and isolation. This is categorically different from graded exercise therapy and must be adapted for PEM.
Heat and cold for symptomatic relief — warm baths, heat packs, cooling cloths — these do not treat the underlying sensitisation but provide meaningful day-to-day comfort for musculoskeletal and nerve pain. They cost nothing and carry no harm.
Quick Answers
Why do I have pain all over with no obvious cause?
Because Long Covid pain causes central sensitisation the nervous system’s pain processing system becomes hypersensitised and amplifies signals beyond what the physical input warrants. The pain is real and biological. It is generated by the central nervous system rather than by tissue damage in specific locations, which is why it is widespread and does not localise to one injury or area.
Is fibromyalgia the same as Long Covid pain?
For many patients they are the same biological process central sensitisation triggered by SARS-CoV-2. A June 2025 study confirmed that once Long Covid is considered in patients without clear organ damage, it fits best as a central sensitisation syndrome in the same family as fibromyalgia and ME/CFS. A fibromyalgia diagnosis after Covid infection is almost certainly Long Covid expressing itself through the pain system, not a coincidental separate condition
Why do painkillers not help much?
Because standard painkillers work on peripheral pain signals the signals from damaged or inflamed tissue. Central sensitisation pain is generated in the brain and spinal cord’s processing systems. The problem is in the amplifier, not the input. Medications that target central nervous system sensitisation amitriptyline, duloxetine, low-dose naltrexone are generally more effective than standard analgesics for this type of pain.
What is allodynia and could I have it?
Allodynia is pain from stimuli that should not cause pain light touch, clothing on skin, mild temperature change. It is a hallmark of central sensitisation and is experienced by a significant proportion of Long Covid patients. If gentle touch or ordinary sensations produce pain or marked discomfort, that is allodynia. It is biological and it responds to approaches that reduce central sensitisation rather than to conventional pain management.
Why does my pain get worse after activity?
For the same reason all Long Covid symptoms worsen with exertion post-exertional malaise involves an immune and neurological response to effort that amplifies central sensitisation alongside all other symptoms. The pain flare after activity in Long Covid is not the same as muscle soreness after exercise. It is the sensitised nervous system responding disproportionately to demand.
Will Long Covid pain improve?
For most people, yes gradually over time with appropriate management. Central sensitisation can reduce as neuroinflammation resolves and the conditions that sustain it are addressed. Improving sleep, pacing carefully, and targeting the neuroinflammatory drivers all support this process. The timeline is individual and non-linear, but improvement is documented and realistic for the majority.
Why does light feel painful or overwhelming in Long COVID
n Long COVID, sensitivity to light is not simply an eye problem. It reflects how the brain processes sensory input.
Central sensitisation lowers the threshold at which stimuli are perceived as uncomfortable or painful. Light signals that would normally be filtered and tolerated are amplified as they pass through the nervous system. At the same time, neuroinflammation and altered brain connectivity, particularly in regions involved in sensory processing, can make the visual system more reactive.
This is why people often describe light not just as bright, but as physically uncomfortable or exhausting. It frequently coexists with headaches, brain fog, and fatigue, suggesting a shared underlying mechanism rather than an isolated symptom.
Importantly, this is not psychological sensitivity. It is a measurable change in how sensory information is processed by the brain.
Why do sounds feel too loud or even painful in Long COVID
Sound sensitivity in Long COVID, sometimes described as hyperacusis, reflects the same underlying nervous system dysregulation seen in chronic pain.
The brain normally filters background noise and adjusts the perceived intensity of sounds. In a sensitised state, this filtering is impaired. Ordinary sounds may feel disproportionately loud, intrusive, or even physically uncomfortable.
This can be driven by central sensitisation, autonomic dysregulation, and heightened threat processing in the brain, where neutral stimuli are interpreted as more intense or stressful than they should be. Over time, this can lead to avoidance of noisy environments, increased fatigue after exposure, and worsening of other symptoms such as headaches or cognitive overload.
As with pain, the issue is not the external stimulus itself, but how the nervous system is processing it.
Can Long COVID cause joint pain even if there is no arthritis?
Yes. Many people experience joint pain despite having normal X-rays and no evidence of inflammatory arthritis. In Long COVID, joint pain is often related to altered pain processing, neuroinflammation or surrounding muscle dysfunction rather than permanent joint damage. However, new or persistent joint swelling should always be assessed by a healthcare professional to exclude inflammatory or autoimmune conditions.
Should I keep exercising if movement makes my pain worse?
Not necessarily. If pain consistently worsens 12 to 48 hours after activity, it may be part of post-exertional malaise rather than simple muscle soreness. In this situation, pushing through symptoms can make recovery more difficult. Gentle, symptom-guided movement within your energy limits is usually more appropriate than fixed exercise programmes.
Deeper reading in this cluster: Post-Exertional Malaise · Long Covid Fog · Long Covid and Sleep · Small Fibre Neuropathy and Long Covid · Long Covid Fatigue
Disclaimer: This guide is for educational purposes only and does not replace medical advice. Always consult your GP or a qualified healthcare professional about your symptoms and before starting any medication or supplement.
About Long Covid Pain Guide
This guide combines current scientific research with the lived experience of people living with Long COVID to explain why pain can persist long after the initial infection. It explores central sensitisation, small fibre neuropathy, neuroinflammation, autonomic dysfunction and the overlap with conditions such as fibromyalgia and ME/CFS, translating complex pain science into clear, practical language. As research into Long COVID continues to evolve, this article is regularly reviewed and updated to reflect the latest evidence. It is intended for educational purposes and should not replace personalised medical advice from your GP or healthcare professional.