Pain in Long COVID: Headaches, Muscle Aches, and Joint Pain Explained

While extreme fatigue and respiratory issues are often the most publicized symptoms of Long COVID, chronic pain is actually one of the most frequently reported and debilitating manifestations. According to comprehensive systematic reviews, up to 45.1% of patients hospitalized for COVID-19 report persistent musculoskeletal pain months after their initial discharge. Crucially, for a significant portion of these individuals, this is entirely new-onset pain, rather than the exacerbation of a pre-existing injury or condition. The sheer scale of this issue highlights that the virus fundamentally alters the body's pain processing and inflammatory pathways.

This pain does not discriminate by age or prior fitness level. Many individuals who were highly active, athletic, and entirely pain-free before their COVID-19 infection suddenly find themselves grappling with widespread, migrating aches that refuse to subside. The pain can be localized, such as a persistent tension headache or sharp chest pain, or it can be systemic, presenting as a deep, full-body ache that mimics conditions like fibromyalgia. Understanding the vast scope of this symptom is the first step in validating the experiences of millions of long-haulers worldwide.

It is vital to distinguish the pain experienced in Long COVID from the standard muscle soreness one might feel after a strenuous workout or a typical bout of the flu. Everyday aches are usually the result of localized tissue damage or temporary lactic acid buildup, and they resolve predictably with rest and time. In stark contrast, Long COVID pain is often unpredictable, migrating from one joint or muscle group to another without any apparent trigger. It frequently possesses a neuropathic quality—described as burning, tingling, or electric shocks—indicating that the nervous system itself is compromised.

Furthermore, this pain is highly resistant to standard over-the-counter analgesics like ibuprofen or acetaminophen. Because the root cause is not simple localized inflammation, but rather a complex interplay of immune dysregulation and neurological misfiring, traditional painkillers often provide little to no relief. This unique profile necessitates a completely different approach to pain management, focusing on calming the nervous system and addressing cellular-level dysfunction rather than just masking the symptom.

In the context of Long COVID, pain and fatigue are inextricably linked, often feeding into a vicious, self-perpetuating cycle. Dealing with chronic pain is inherently exhausting; the brain expends a massive amount of metabolic energy constantly processing pain signals, leaving very little energy for cognitive tasks or physical activity. This constant energy drain contributes significantly to the profound exhaustion that characterizes the condition. For a deeper dive into the mechanics of this exhaustion, you can read our comprehensive Understanding Long COVID: Causes, Symptoms, and What the Science Says guide.

Moreover, pain is frequently a primary feature of post-exertional malaise (PEM), a hallmark symptom of Long COVID and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). When a patient with PEM exceeds their energy envelope—whether through physical exertion, cognitive effort, or emotional stress—they don't just feel tired; they often experience a severe flare-up of body-wide pain. This delayed exacerbation of myalgia and arthralgia is a clear indicator that the body's cellular energy production and inflammatory regulation systems are severely compromised.

To understand why Long COVID causes such widespread pain, we must look at the cellular level, starting with neuroinflammation. During the acute phase of a SARS-CoV-2 infection, the immune system releases a flood of pro-inflammatory cytokines to fight the virus. In Long COVID, this immune response fails to shut off properly. Viral remnants, immune dysregulation, or persistent systemic inflammation trigger the activation of glial cells—specifically microglia and astrocytes—in the central nervous system (CNS). These cells act as the immune sentinels of the brain and spinal cord.

When activated, these glial cells continuously release pro-inflammatory cytokines, such as IL-1β, IL-6, and TNF-α. In the peripheral nervous system, these cytokines directly sensitize skin nociceptors (pain receptors), leading to localized pain and neurogenic inflammation. In the CNS, the persistent release of these chemicals disrupts normal pain regulation by potentiating NMDA receptor function and suppressing inhibitory pathways. This creates a highly excitable neuronal state where pain signals are amplified rather than suppressed.

Driven by this prolonged neuroinflammation, the central nervous system essentially gets stuck in a state of "chronic high alert," a phenomenon known as central sensitization. Central sensitization is the primary driver of the widespread, generalized muscle and joint pain often reported by Long COVID patients. The brain and spinal cord undergo neuroplastic changes that fundamentally alter how sensory input is processed. This means that normal, non-painful sensory inputs—like the brush of clothing against the skin—are misinterpreted by the brain as painful, a condition known as allodynia.

Additionally, stimuli that are normally only mildly uncomfortable are felt as excruciatingly painful, a state called hyperalgesia. This results in "nociplastic pain," which is pain that occurs without any ongoing, obvious tissue damage or peripheral inflammation. Studies utilizing the Central Sensitization Inventory (CSI) have found a remarkably high prevalence of central sensitization in Long COVID patients, explaining why the pain is so widespread and why it often presents alongside sensory overload, brain fog, and sleep disturbances.

While central sensitization explains the widespread, aching pain, Small Fiber Neuropathy (SFN) provides the biological explanation for the intense, localized neuropathic pain and autonomic symptoms frequently seen in Long COVID. SFN involves the structural damage or functional impairment of the small, myelinated Aδ-fibers and unmyelinated C-fibers in the peripheral nervous system. These specific nerve fibers are responsible for transmitting pain and temperature sensations, as well as controlling involuntary autonomic functions like heart rate, blood pressure, and digestion.

The damage to these fibers is believed to be caused by a combination of neuroinflammation, innate immune cell attacks (where macrophages mistakenly target nerve fibers), and potential molecular mimicry. A landmark 2024 case-control study published in the journal Pain found that approximately 50% of Long COVID patients experiencing chronic pain exhibited small fiber neuropathy. This was confirmed via skin biopsies showing reduced intraepidermal nerve fiber density. This nerve damage directly correlates with the burning, tingling, and "pins and needles" sensations patients endure daily.

SARS-CoV-2 is fundamentally a vascular disease just as much as a respiratory one, and damage to the blood vessels plays a profound role in long-term pain. The virus binds to ACE2 receptors, which are highly concentrated on the endothelium—the delicate inner lining of blood vessels. Even after the virus is cleared, systemic inflammation and oxidative stress leave the endothelium dysfunctional. This dysfunction is characterized by a reduction in nitric oxide, which normally helps vessels dilate, and the creation of a pro-thrombotic, or clotting, environment within the bloodstream.

This dysfunctional endothelium leads to the formation of amyloid fibrin microclots. These microscopic clots block tiny capillaries, preventing vital oxygen and nutrients from reaching tissues, muscles, and nerves. This resulting localized hypoxia (oxygen starvation) generates profound deep muscle pain, chest pain, and heavily contributes to post-exertional malaise. The large-scale TUN-EndCOV study found that almost 50% of their Long COVID cohort had impaired endothelial function, which was significantly associated with symptoms like chest pain and severe fatigue.

Living with the pain of Long COVID is an intensely isolating experience, largely because the suffering is entirely invisible to the outside world. Many patients describe their daily reality as feeling like they have "run a marathon while battling a severe case of the flu," even when they have barely left their bed. The pain is often described as a heavy, leaden ache deep within the muscles, punctuated by sharp, unpredictable stabbing sensations in the joints. Because they may look perfectly healthy on the outside, patients frequently struggle to convey the sheer magnitude of their physical distress to friends, family, and employers.

This invisibility often leads to a profound sense of grief and loss of identity. Individuals who previously defined themselves by their physical capabilities—whether through sports, demanding careers, or active parenting—are suddenly forced to navigate a body that feels alien and uncooperative. The emotional toll of this chronic, invisible pain cannot be overstated, as it requires a daily, exhausting performance to mask the discomfort and attempt to function in a society that rarely accommodates chronic illness.

One of the most terrifying and frequently reported pain manifestations in Long COVID is severe chest pain. Patients often describe this not as a typical muscular ache, but as a deep, searing "lung burn" or a sensation of a tight, restrictive band wrapped around their ribcage. This pain can mimic the terrifying symptoms of a heart attack, leading to numerous traumatic and ultimately inconclusive visits to the emergency room. The unpredictable nature of this chest pain—flaring up without warning or in delayed response to minor exertion—creates a constant state of hypervigilance and anxiety.

This specific type of pain is often linked to the endothelial dysfunction and microvascular damage discussed earlier, as well as potential post-viral pericarditis or costochondritis (inflammation of the cartilage that connects a rib to the breastbone). Patients describe the frustration of trying to take a deep breath only to be stopped short by a sharp, stabbing pain, further exacerbating the feeling of air hunger and shortness of breath that so often accompanies the condition.

Perhaps the most universally validating yet frustrating experience shared by Long COVID patients is the massive gap between their objective, debilitating pain and the results of standard medical diagnostics. A patient may present to their primary care physician with severe, migrating polyarthralgia and burning neuropathic pain, only to have routine blood panels (like basic metabolic panels, standard inflammatory markers like CRP, and autoimmune screens) return completely within normal limits. X-rays and standard MRIs of painful joints often show no structural damage or acute inflammation.

This diagnostic gap frequently leads to medical gaslighting, where well-meaning but uninformed providers suggest the pain is psychosomatic or strictly the result of anxiety and depression. However, as the research clearly shows, the mechanisms driving Long COVID pain—such as microglial activation, small fiber nerve damage, and microvascular clotting—cannot be detected by standard routine blood work. Validating this gap is crucial: just because a standard test cannot see the pain does not mean the physiological damage is not profoundly real.

The scientific literature has rapidly expanded to quantify exactly how common these pain symptoms are among the Long COVID population. A comprehensive 2024 systematic review and meta-analysis published in Frontiers in Medicine, which analyzed 64 distinct studies, found a pooled prevalence of muscle pain (myalgia) at 28% among individuals recovering from COVID-19. Strikingly, the burden of this myalgia remains remarkably high over time, with prevalence dropping only slightly to 25.9% even at 12 months post-infection. This data confirms that post-COVID muscle pain is not a transient issue, but a chronic condition for millions.

Joint pain (arthralgia) and headaches also show alarmingly high prevalence rates. The same 2024 meta-analysis established a pooled prevalence of joint pain at 14.8%, with the knee frequently reported as one of the primary sites of discomfort. Meanwhile, large-scale meta-analyses show the pooled incidence of persistent headaches in Long COVID is approximately 16%. Interestingly, experiencing a severe headache during the acute phase of a COVID-19 infection is a powerful prognostic indicator; one cross-sectional study found that acute-phase headaches increase the odds of developing long-term neuropathic pain by 4.9 times.

Research has also illuminated the relationship between the severity of the initial COVID-19 infection and the subsequent development of chronic pain. While it is well-documented that even mild or asymptomatic cases of COVID-19 can lead to severe Long COVID, statistical data shows a clear correlation with hospitalization. A 2024 Mendelian randomization study published in PLOS One demonstrated a direct causal relationship between the severity of acute COVID-19 (specifically cases requiring hospitalization) and an increased risk of developing lower leg joint pain, back pain, and widespread body pain.

Furthermore, there is well-documented sexual dimorphism in the prevalence of Long COVID pain. A massive "mega-systematic review" evaluating 429 studies globally established that females have a significantly higher pooled prevalence of Long COVID overall, and a substantially higher likelihood of developing post-COVID myalgia, arthralgia, and widespread chronic nociplastic pain compared to male cohorts. This highlights the need for sex-specific research into immune responses and pain modulation.

Because there are currently no FDA-approved therapies specifically for Long COVID, clinical trials have focused heavily on repurposing existing medications to target the underlying mechanisms of pain. One of the most promising areas of research involves Low Dose Naltrexone (LDN). A 2024 study by Griffith University found that Long COVID patients suffer from faulty TRPM3 ion channels in their immune cells, and in vitro testing showed that LDN successfully restored the function of these ion channels, regulating calcium influx and improving immune response.

Clinical outcomes support these cellular findings. A retrospective study published by Stanford University researchers reviewed 59 Long COVID patients treated with LDN. The patients reported significantly fewer overall symptoms, with marked improvements in functional status, post-exertional malaise, and pain levels. Additionally, a 2024 systematic review pooling data from multiple LDN Long COVID cohorts showed a large, statistically significant effect size favoring LDN for the direct reduction of pain. These trials provide crucial evidence that targeting neuroinflammation, rather than just masking pain, is the most effective clinical path forward.

When dealing with a complex, multi-system condition like Long COVID, the standard "1 to 10" pain scale used in most doctor's offices is often woefully inadequate. A simple number cannot capture the difference between a dull, aching muscle pain that allows for some movement, and a sharp, burning neuropathic pain that makes wearing clothes agonizing. To accurately track your symptoms, it is crucial to move beyond simple numbers and start recording the quality, location, and behavior of the pain. Is it throbbing, stabbing, burning, or aching? Does it migrate from joint to joint, or is it localized to the chest and head?

Patients and providers are increasingly utilizing more comprehensive assessment tools, such as the Central Sensitization Inventory (CSI) or the McGill Pain Questionnaire, which account for the sensory and emotional qualities of chronic pain. By tracking these specific descriptors, you provide your healthcare team with vital clues about the underlying mechanisms. For instance, a persistent "burning" or "electric" sensation strongly points toward small fiber neuropathy, whereas a widespread, deep "bruised" feeling may indicate central sensitization and neuroinflammation.

One of the most critical aspects of tracking Long COVID pain is identifying its relationship to exertion and potential triggers. Because pain is a primary feature of post-exertional malaise (PEM), it rarely occurs in a vacuum. It is essential to track not just when the pain occurs, but what you were doing 24 to 72 hours prior to the flare-up. Did you walk further than usual? Did you engage in a highly stressful cognitive task, like a long Zoom meeting? Did you eat a meal high in histamines or processed sugars?

By maintaining a detailed symptom and activity diary, you can begin to map out your unique "energy envelope." You may discover that your severe muscle aches consistently peak two days after exceeding a specific step count, or that your joint pain flares up during periods of poor sleep. Understanding these delayed reactions is the cornerstone of effective pacing, allowing you to modify your behavior to prevent the severe pain crashes associated with PEM.

Gathering data is only half the battle; effectively communicating that data to a healthcare provider during a brief 15-minute appointment is a separate challenge. Instead of handing over pages of daily logs, synthesize your tracking into a concise summary. Highlight the most severe types of pain, their frequency, and the specific triggers you have identified. Use clear, objective language: "I experience burning pain in my lower extremities that reaches an 8/10 severity approximately 48 hours after walking more than 2,000 steps."

Visual aids can also be incredibly helpful. Consider creating a simple graph showing the correlation between your activity levels and your pain spikes over a two-week period. Additionally, clearly articulate how the pain impacts your activities of daily living (ADLs). Stating that "the joint pain in my hands prevents me from holding a toothbrush or typing for more than five minutes" provides a much clearer clinical picture of your functional impairment than simply saying "my hands hurt."

Because traditional NSAIDs (like ibuprofen) and opioids are generally ineffective for the neuroinflammatory and neuropathic pain of Long COVID, medical management often relies on off-label pharmacological treatments. As highlighted by recent clinical trials, Low Dose Naltrexone (LDN) has emerged as a frontline therapy. By acting as a TLR4 antagonist, LDN blocks the receptors on microglial cells, effectively turning down the volume on the central nervous system's inflammatory response. Patients typically start at a very low dose (e.g., 0.5 mg to 1.5 mg) and slowly titrate up to a maximum of 4.5 mg daily to minimize side effects and find their optimal therapeutic window.

For patients whose pain is heavily driven by central sensitization and nerve hyperexcitability, providers may also prescribe neuromodulators. Medications such as gabapentin, pregabalin, or SNRIs like duloxetine are frequently utilized to stabilize nerve membranes and alter how the brain processes pain signals. In severe cases of dysautonomia and confirmed small fiber neuropathy, more aggressive immunomodulatory therapies, such as Intravenous Immunoglobulin (IVIg), are being investigated to halt the autoimmune attack on the peripheral nerves. Always consult with a qualified healthcare provider before starting or stopping any prescription medication.

Nutrition plays a foundational role in managing the chronic low-grade inflammation that fuels Long COVID pain. Transitioning to an anti-inflammatory, Mediterranean-style diet has shown significant promise in clinical settings. The BioICOPER study published in Nutrients (2025) found that Long COVID patients who strictly adhered to a Mediterranean diet exhibited significantly lower systemic inflammation, which is critical for alleviating musculoskeletal ache. This approach emphasizes high intakes of Omega-3 fatty acids (found in wild salmon and walnuts), polyphenol-rich berries, and extra virgin olive oil, while strictly eliminating ultra-processed foods, refined sugars, and pro-inflammatory seed oils.

For a subset of Long COVID patients, pain is heavily influenced by Mast Cell Activation Syndrome (MCAS). When mast cells become hyperactive, they release massive amounts of histamine and other inflammatory mediators into the tissues, causing severe migrating joint and muscle pain. For these individuals, a temporary low-histamine elimination diet—avoiding aged cheeses, fermented foods, cured meats, and certain vegetables like spinach and tomatoes—can provide profound pain relief. This dietary intervention should ideally be guided by a clinical dietitian to ensure nutritional adequacy while identifying specific dietary triggers.

In addition to whole-food nutrition, targeted supplements can provide essential support for cellular repair and nerve health. Alpha Lipoic Acid (ALA) is a potent antioxidant that has been extensively studied for its ability to repair nerve damage and reduce neuropathic pain, making it highly relevant for Long COVID patients dealing with small fiber neuropathy. You can learn more about its specific mechanisms in our guide: Can Alpha Lipoic Acid Support Energy Levels and Nerve Health for Long COVID Patients?.

Magnesium is another critical mineral, as it acts as a natural NMDA receptor blocker, helping to calm the overactive nervous system seen in central sensitization. Specifically, Magnesium Glycinate is highly bioavailable and gentle on the stomach, providing targeted support for muscle relaxation and neurological calming. Explore the benefits in our article: Can Magnesium Glycinate Support Energy and Calm the Nervous System in Long COVID and POTS?. Finally, ensuring adequate Vitamin D levels is crucial for immune modulation and reducing systemic inflammation; discover more in our guide: Can Vitamin D3 50,000 IU Support Energy and Immune Function in Long COVID and ME/CFS?.

No pain management strategy for Long COVID is complete without rigorous pacing. Because physical and cognitive exertion can trigger severe pain flares due to post-exertional malaise, learning to stay within your energy envelope is a non-negotiable medical intervention. This is not about "pushing through" the pain to build endurance; in fact, pushing through is actively harmful and can cause long-term metabolic damage. Pacing involves breaking tasks into smaller, manageable chunks and resting before you feel tired or in pain.

Many patients find success with objective pacing tools, such as heart rate monitoring. By identifying your anaerobic threshold—the heart rate at which your body switches from aerobic to anaerobic energy production, often prematurely low in Long COVID—you can set alarms on a smartwatch to warn you before you overexert yourself. By keeping your heart rate below this threshold during daily activities, you can significantly reduce the frequency and severity of your muscle and joint pain crashes, allowing the nervous system the quiet time it needs to begin healing.

If you are living with the relentless headaches, muscle aches, and joint pain of Long COVID, the most important thing to know is that your pain is real. It is not in your head, it is not a sign of weakness, and it is not a psychological failing. The scientific community has definitively proven that this pain is rooted in complex, measurable physiological dysfunctions, from neuroinflammation and central sensitization to microscopic blood clots and damaged nerve fibers. Validating this biological reality is the crucial first step in moving away from self-blame and toward effective, targeted management.

Navigating a chronic, invisible illness is an incredibly heavy burden, and it is entirely normal to feel grief, frustration, and anger at the loss of your previous physical capabilities. Acknowledging these emotions, while simultaneously arming yourself with the latest scientific knowledge, empowers you to become a stronger advocate for your own health in clinical settings. You deserve care that addresses the root causes of your symptoms rather than just dismissing them.

While there is currently no magic pill to instantly cure Long COVID pain, a comprehensive, multidisciplinary approach can drastically improve your quality of life. By combining off-label therapeutics like Low Dose Naltrexone, anti-inflammatory nutritional strategies, targeted nerve-supporting supplements, and strict pacing protocols, many patients are successfully lowering their baseline pain levels and expanding their energy envelopes. Healing from neuroimmune conditions is rarely linear, but with the right tools and support, progress is absolutely possible.

At RTHM, we understand the profound complexities of Long COVID, ME/CFS, and related chronic conditions. Our clinical approach is rooted in the latest scientific research, focusing on the underlying mechanisms driving your symptoms rather than just offering generic advice. If you are looking for evidence-based support and targeted interventions to help manage your chronic pain and fatigue, we are here to help. Explore RTHM's comprehensive care options and discover a path forward designed specifically for complex chronic illness.