Living with Fibromyalgia: The Evidence-Based Guide

Fibromyalgia is a chronic condition characterised by widespread musculoskeletal pain, fatigue, sleep disturbances, and cognitive difficulties (often referred to as “fibro fog”). It affects an estimated 2 to 8% of the global population, making it one of the most common chronic pain conditions worldwide [2, 17].

For decades, fibromyalgia sat in an awkward no man’s land in medicine. Doctors could not find structural damage to explain the pain. Blood tests came back normal. X-rays showed nothing. The conclusion, far too often, was that patients were exaggerating, anxious, or simply not coping well with life. That conclusion was wrong.

What we now understand is that fibromyalgia involves real, measurable changes in the central nervous system. Specifically in how pain signals are amplified and processed. It is not about damage at the site of pain. It is about a nervous system that has become significantly more sensitive than it should be [2].

This is called central sensitisation, and it is the cornerstone of modern fibromyalgia science. The brain and spinal cord in people with fibromyalgia appear to turn the volume up on pain signals, meaning that inputs that would not normally cause pain or discomfort register as painful. Things like light pressure, temperature changes, or even certain sounds can trigger a pain response that would not affect most people [7].

Fibromyalgia is more common in women, though this sex ratio is partly a product of diagnostic bias, as men are frequently under-diagnosed [18]. It can develop at any age, though it most commonly presents between the ages of 30 and 60. It often follows a triggering event: a physical injury, a viral illness, a period of prolonged psychological stress, or sometimes no identifiable trigger at all.

It is not an autoimmune condition. It is not an inflammatory arthritis. It does not cause joint damage or organ damage. But it is debilitating, it is real, and it responds to the right approach.

→ Read more on the pain mechanisms in fibromyalgia and hypermobility

A 2023 systematic review and meta-analysis including 68 randomised controlled trials and 5,474 participants found that exercise-based therapy significantly reduces pain, improves quality of life, and reduces anxiety in fibromyalgia [9]. The effect on pain reduction was maintained at 12-week follow-up, with the most effective dose being 3 sessions per week, 21 to 40 sessions total, and 61 to 90 minutes per session.

Aerobic exercise reduces pain perception and improves both mental and physical quality of life. Resistance exercise decreases pain and improves physical function. Even stretching shows significant pain-reduction effects [10].

Mind-body exercise, including Tai Chi and Qigong, appears particularly effective for overall quality of life. These forms of movement combine physical activity with regulated breathing, attentional focus, and a parasympathetic-activating effect that may address multiple drivers of fibromyalgia simultaneously.

Pilates and yoga get recommended for fibromyalgia almost as often as Tai Chi, but the evidence base is thinner than the marketing suggests. The entire global Pilates literature for fibromyalgia pools to around 265 participants across six trials, anchored on a 2009 pilot, with effects that fade once supervised sessions stop. Yoga has more evidence for fibromyalgia and acts as a general mind-body intervention, with the same caveats around end-range flexibility for anyone hypermobile. Our full evidence reviews walk through the trials, MCID thresholds, and what each practice actually does and does not do: Pilates for hypermobility and fibromyalgia, what the research actually shows and yoga for chronic pain and hypermobility, what the evidence actually shows.

Why People Struggle (and Why That Makes Sense)

The main reason exercise is difficult in fibromyalgia is not lack of motivation. It is post-exertional malaise (PEM): the worsening of symptoms that follows exertion. The nervous system in fibromyalgia does not recover from exercise in the same way a healthy nervous system does. This is why “just push through it” is actively bad advice.

Starting too hard, too fast is the most common mistake. Research confirms that lower-intensity exercise has lower dropout rates in fibromyalgia, and that continuous supervision significantly improves adherence [9]. The goal in the early stages is not fitness. It is demonstrating to the nervous system that movement is safe.

Graded Exercise and Outdoor Activity

Graded exercise, where you gradually increase duration and intensity over time starting well below your perceived capacity, is the recommended approach. The key is pacing the progression so that the nervous system can adapt without triggering a significant flare. Our dedicated breakdown of exercise for fibromyalgia goes into this in practical detail.

Outdoor exercise has a particular advantage. Nature exposure has documented effects on cortisol levels, autonomic nervous system activity, and mood, all of which are relevant in fibromyalgia. Walking in green spaces or natural environments adds a restorative dimension to movement that purely indoor exercise does not provide. See our look at outdoor exercise for fibromyalgia.

And for those interested in martial arts, the combination of body awareness, regulated breathing, and progressive physical challenge makes certain martial arts formats surprisingly well-suited to fibromyalgia. We have explored martial arts and self-defence in fibromyalgia for anyone curious.

Stretching

Stretching is often undervalued in fibromyalgia management, but gentle mobility work can reduce musculoskeletal tension, improve range of motion, and provide a low-intensity way to keep the body moving on difficult days. Our guide to stretching for fibromyalgia covers the best approach.

→ Read the full exercise guide for fibromyalgia

One of the most frustrating aspects of fibromyalgia is the diagnostic process. Many people spend years, sometimes over a decade, being told their pain is unexplained, being referred between specialists, and having tests come back normal. The average diagnosis delay is still around two to three years in many healthcare systems.

The current gold standard is the 2016 revised criteria from the American College of Rheumatology (ACR), published by Wolfe and colleagues [1]. These criteria replaced the older 1990 tender point examination model, which required a clinician to press on 18 specific points on the body. The problem with that approach was that it was unreliable, highly examiner-dependent, and missed many genuine cases.

The 2016 ACR Criteria

The current diagnostic criteria require all three of the following:

• Widespread Pain Index (WPI) score of 7 or more and a Symptom Severity Scale (SSS) score of 5 or more, OR a WPI of 4 to 6 with an SSS of 9 or more.
• Generalised pain in at least 4 of 5 body regions (left upper, right upper, left lower, right lower, axial). This replaced the old left/right, above/below the waist requirement.
• Symptoms present for at least 3 months at a similar level.

The WPI asks about pain in 19 specific body areas over the last week. The SSS captures the severity of fatigue, unrefreshed sleep, and cognitive symptoms, plus a list of associated somatic symptoms including headaches, abdominal pain, and depression [1].

Crucially, the 2016 criteria also clarified that fibromyalgia can be diagnosed alongside other conditions. You can have rheumatoid arthritis and fibromyalgia. You can have lupus and fibromyalgia. The presence of another condition that could explain some pain does not rule out fibromyalgia as a co-existing diagnosis [3].

When it comes to getting a diagnosis, it is worth knowing that no specialist holds exclusive ownership of fibromyalgia. GPs can diagnose it. Rheumatologists, neurologists, and pain physicians commonly do too. What is important is that the clinician is familiar with the current criteria and is not defaulting to the outdated tender point model.

→ Read our breakdown of fibromyalgia and back pain

The honest answer is: we do not have a single, definitive cause. Fibromyalgia is almost certainly not one disease with one cause, but rather a common end-point that multiple different biological and psychological processes can lead to. Here is what the research currently points to.

Central Sensitisation

The most robustly supported mechanism is central sensitisation. This is an amplification of pain processing in the central nervous system. Studies consistently show that people with fibromyalgia have lower pain thresholds, heightened responses to pressure and temperature, and deficient conditioned pain modulation (the nervous system’s own ability to dampen pain signals) [7, 20].

Brain imaging studies have found altered activation patterns in pain-processing regions, and changes in the functional connectivity between brain structures involved in sensory processing. The nervous system has, in effect, recalibrated itself to a hair-trigger state [8].

For a deeper look at the mechanisms behind this, our breakdown of the pain mechanisms in fibromyalgia and hypermobility goes into this in much more detail.

Neuroinflammation and Glial Activation

Neuroinflammation, which is inflammation within the nervous system itself, is increasingly implicated in fibromyalgia. Microglia, the brain’s resident immune cells, appear to become activated in fibromyalgia, driving a low-grade inflammatory process within the central nervous system. This is not the same as systemic inflammation (which is why standard inflammatory markers like CRP and ESR are usually normal in fibromyalgia), but it may contribute significantly to the pain sensitisation, fatigue, and cognitive symptoms seen in the condition [6].

Mast Cells

Mast cells are immune cells found throughout the body, including in the brain. Research suggests they play a meaningful role in fibromyalgia, with evidence that mast cell mediators, including histamine, substance P, and pro-inflammatory cytokines like IL-6 and TNF, may contribute to neuroinflammation and pain sensitisation [6, 19].

Thalamic mast cells, in particular, have been proposed to stimulate nociceptive neurons and activate microglia, creating a feedback loop that maintains the pain state. This is a relatively new and evolving area of research, but one with significant therapeutic implications. We have covered the mast cell connection in fibromyalgia in more detail elsewhere on the site.

Small Fibre Neuropathy

One of the more significant developments in fibromyalgia research over the last decade has been the discovery that a proportion of people with fibromyalgia have small fibre neuropathy (SFN). This involves actual damage to the small, unmyelinated nerve fibres that run throughout the skin and internal organs.

A 2022 meta-analysis found consistent evidence of small fibre impairment in fibromyalgia patients across studies [4]. A 2024 study found small fibre pathology in approximately 50% of people with fibromyalgia assessed using corneal confocal microscopy [5]. This is significant because it suggests that in a substantial proportion of cases, fibromyalgia has a peripheral component, not just a central one.

It also helps explain some of the stranger symptoms: burning sensations, temperature sensitivity, autonomic dysfunction, and the patterns of itching and skin sensitivity that many people with fibromyalgia experience.

Childhood Adversity and Early Life Stress

The relationship between early life adversity and fibromyalgia is now well-established. A 2023 systematic review confirmed that adverse childhood experiences (ACEs) are significantly associated with the development of chronic pain in adulthood, with an adjusted odds ratio of 1.45 [16]. Childhood physical abuse, emotional abuse, and neglect all independently increase the risk of later chronic pain conditions including fibromyalgia.

The mechanisms are real and physiological. Early life stress can alter the development of the HPA axis (the body’s stress response system), dysregulate cortisol patterns, and reshape how the developing nervous system processes threat and pain. These are not just “psychological” effects. They leave biological traces that persist into adulthood. We have explored childhood adversity and chronic pain in detail for those who want to go deeper on this.

Genetics and Autonomic Dysregulation

Fibromyalgia tends to run in families, suggesting a genetic component, though no single causative gene has been identified. Autonomic nervous system dysfunction is also consistently found, involving an imbalance between the sympathetic (“fight or flight”) and parasympathetic (“rest and digest”) branches, in people with fibromyalgia, contributing to symptoms like low blood pressure, heart rate irregularities, and disrupted sleep [20].

→ Read more on the mast cell connection in fibromyalgia

Fibromyalgia is not one symptom. It is a constellation. And for many people, the sheer number and variety of symptoms makes it hard to communicate to others just how much is going on. Here is a breakdown of what the research and clinical experience tell us about the symptom picture.

Widespread Pain

The defining feature. Pain that moves, spreads, and shifts, affecting muscles, joints, and soft tissue across multiple body regions. It can feel like aching, burning, stabbing, or pressure. It is often worse in the morning, in cold weather, after exertion, and during periods of stress.

Headaches

Headaches are extremely common in fibromyalgia, affecting the majority of those diagnosed. They range from tension-type headaches to full migraine episodes. The connection to fibromyalgia is partly central sensitisation, partly autonomic dysfunction, and partly the overlap with musculoskeletal tension in the neck and upper back. Our deep-dive on headache management in fibromyalgia covers this in detail.

Back Pain

Back pain is one of the most common presentations in fibromyalgia. The mechanisms overlap with central sensitisation and musculoskeletal deconditioning. Understanding whether back pain is primarily from fibromyalgia or from a structural issue is important for treatment. See our breakdown of back pain in fibromyalgia.

Costochondritis

Chest wall pain is surprisingly common in fibromyalgia. Costochondritis, the inflammation or sensitivity of the cartilage connecting the ribs to the sternum, can cause significant chest pain that is often mistaken for cardiac symptoms. This can be frightening, but it is a recognised feature of fibromyalgia. More on costochondritis and fibromyalgia here.

Sciatica-Like Pain

Radiating pain down the legs is reported by many people with fibromyalgia, and it can mimic sciatica closely. In some cases it is sciatica, but in others it is referred pain driven by central sensitisation and musculoskeletal dysfunction. We have covered the fibromyalgia and sciatica overlap in detail.

Eye Pain

This catches many people off guard. Eye pain, dry eyes, sensitivity to light, and visual disturbances are all reported in fibromyalgia. The small fibres innervating the cornea and eye are the same fibres implicated in small fibre neuropathy, which may explain some of these symptoms. More on eye symptoms in fibromyalgia.

Itching

Itching without a visible skin cause is something many people with fibromyalgia experience but rarely mention to their doctor. It is driven by the same central sensitisation mechanisms that create pain. The nervous system is misinterpreting signals. We have looked at why itching happens in fibromyalgia and what the science says in a dedicated post.

Hyperalgesia

Hyperalgesia is an increased sensitivity to stimuli that are normally painful, so a pain that would be mild for most people becomes severe for someone with fibromyalgia. It is distinct from allodynia (where normally non-painful stimuli cause pain), though both occur in fibromyalgia. Both are direct expressions of central sensitisation. We have got a full piece on hyperalgesia in fibromyalgia.

Other Common Symptoms

• Irritable bowel syndrome (IBS) and digestive issues
• Bladder sensitivity
• Jaw pain (TMJ dysfunction)
• Restless legs
• Anxiety and depression
• Cognitive difficulties (“fibro fog”), including trouble concentrating, word-finding problems, and memory lapses
• Skin sensitivity, including sensitivity to certain fabrics or touch

→ Read our deep-dive on headache management in fibromyalgia

Temperature sensitivity is one of the most under-discussed features of fibromyalgia, yet it affects the majority of people with the condition. When it comes to temperature regulation, the nervous system’s job is to interpret and respond to thermal changes appropriately. In fibromyalgia, that calibration is off.

Heat Intolerance

Many people with fibromyalgia find that heat, whether from warm weather, hot baths, or exercise, significantly worsens their symptoms. Fatigue increases, pain flares, and cognitive fog deepens. The mechanisms are thought to involve autonomic dysfunction affecting the body’s ability to regulate temperature, as well as the direct sensitisation of thermal pain receptors by small fibre neuropathy. A warm bath that relaxes most people can trigger a multi-day flare in someone with fibromyalgia. We have gone deep on heat intolerance in fibromyalgia.

Cold Intolerance

Cold can be equally problematic. Cold temperatures often increase pain and stiffness, and cold weather is one of the most commonly reported fibromyalgia triggers. Again, the mechanism connects back to sensitised thermal receptors and autonomic dysfunction, the same systems that regulate blood flow and warmth through the body. We have covered cold intolerance in fibromyalgia separately.

There is also the interesting question of cold exposure as a potential therapeutic tool. Cold showers and cold immersion have some evidence for anti-inflammatory and mood-regulating effects, but the picture is far from straightforward for those with fibromyalgia. We have looked at whether cold showers are actually beneficial for fibromyalgia. It is more complicated than some sources would have you believe.

→ Read more on heat intolerance in fibromyalgia

Fatigue in fibromyalgia is not tiredness. It is a profound, unrelenting exhaustion that does not respond normally to rest. You can sleep ten hours and wake up feeling like you have not slept at all. This is not laziness or deconditioning. It is a feature of the condition with specific neurological underpinnings.

Sleep Architecture in Fibromyalgia

Research consistently shows disrupted sleep architecture in fibromyalgia. People with the condition tend to have reduced slow-wave (deep) sleep, the restorative stage where tissue repair and growth hormone release occur. There is also an intrusion of alpha waves into delta sleep (known as alpha-delta sleep), meaning the brain is in a partially aroused state during what should be deep sleep.

The result is non-restorative sleep, regardless of how many hours are spent in bed. And poor sleep, in turn, worsens central sensitisation, creating a vicious cycle where pain disrupts sleep, and disrupted sleep amplifies pain [2].

Heart Rate Variability and the Nervous System

Heart rate variability (HRV), a measure of the variation in time between heartbeats, is a useful window into autonomic nervous system function. Lower HRV is associated with greater sympathetic dominance (the “threat” branch of the nervous system), and this is consistently found in fibromyalgia. Our piece on fibromyalgia and HRV looks at why this matters and what you can do with it.

Napping

Whether napping helps or hinders in fibromyalgia is a question that comes up frequently. The evidence is genuinely mixed. Strategic, short naps may help with cognitive function and acute fatigue, but longer, irregular daytime sleep can fragment night-time sleep and worsen overall sleep quality. We have pulled the research together on napping in fibromyalgia for anyone navigating this.

→ Read more on fibromyalgia and heart rate variability

Medication is a genuine part of fibromyalgia management for many people, but the evidence base is considerably messier than many patients are led to believe. No medication works for everyone. Many have meaningful side effects. And none of them work in isolation from lifestyle and rehabilitative approaches.

Amitriptyline

Amitriptyline, a tricyclic antidepressant, remains one of the most commonly prescribed medications for fibromyalgia in the UK. Used at low doses (typically 10 to 50mg at night), it targets sleep quality and pain rather than depression per se. When it comes to evidence, amitriptyline has a reasonable evidence base for improving sleep architecture and reducing pain in fibromyalgia, though effects tend to diminish over time and side effects, including morning sedation, dry mouth, and weight gain, are common. We have covered amitriptyline for fibromyalgia in detail, including what to expect and how to discuss it with your GP.

Low-Dose Naltrexone (LDN)

Low-dose naltrexone, typically 1.5 to 4.5mg per day and taken off-label, has attracted significant interest in the fibromyalgia community and is increasingly being discussed by clinicians. Its proposed mechanism involves glial cell modulation, reducing neuroinflammation, and downregulating the microglial activation that contributes to central sensitisation [11].

A 2023 systematic review found some evidence that LDN reduces pain and improves quality of life in fibromyalgia, and that it reduces inflammatory biomarkers in serum [11]. A 2024 meta-analysis of randomised controlled trials confirmed this signal, though the evidence base remains limited by small sample sizes and the challenge of blinding in LDN trials [12]. Larger phase III trials (including the INNOVA and FINAL studies) are currently underway.

LDN is well-tolerated in the doses used for fibromyalgia, with the most common side effect being vivid dreams in the early weeks. For many people, it represents a genuine option when other medications have failed. Our breakdown of LDN for fibromyalgia covers the evidence, dosing considerations, and how to have the conversation with your doctor.

Medication, Weight, and the Side Effect Problem

One of the most under-discussed aspects of fibromyalgia medication is weight gain. Several commonly prescribed medications, including amitriptyline, pregabalin, and gabapentin, can contribute to significant weight gain, which in turn worsens fatigue, pain, and quality of life. This creates a difficult cycle. We have addressed fibromyalgia, weight gain, and medication specifically, because it is an issue that deserves honest conversation.

What About NSAIDs and Opioids?

Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen are not effective for fibromyalgia pain in the same way they are for inflammatory conditions, because fibromyalgia pain is not primarily driven by peripheral inflammation. Opioids are even less appropriate. They can actually worsen central sensitisation over time through a mechanism called opioid-induced hyperalgesia. Most guidelines actively recommend against opioid use for fibromyalgia.

For those with hypermobility alongside fibromyalgia, the medication picture becomes even more nuanced. Our in-depth guide to pain medication for hypermobility and EDS covers the full range of options, including local anaesthetic resistance, LDN, and why exercise keeps outperforming medication in the research.

→ Read our breakdown of LDN for fibromyalgia

This is one of the most clinically important areas in fibromyalgia, and one of the most under-recognised. A substantial proportion of people with fibromyalgia also have symptomatic hypermobility, whether that is hypermobile Ehlers-Danlos syndrome (hEDS), hypermobility spectrum disorder (HSD), or simply undiagnosed joint hypermobility.

A 2021 study found that 81% of people with fibromyalgia or ME/CFS met Brighton criteria for hypermobility syndrome, with an odds ratio of 7.08 compared to healthy controls [14]. A 2023 study examining patients at a specialist EDS clinic found that the majority of patients diagnosed with hEDS or HSD also carried a fibromyalgia diagnosis, and that those with both conditions had significantly more severe symptoms across the board [13].

The relationship goes beyond coincidence. Hypermobility involves connective tissue laxity that places continuous stress on joints and supportive structures, generating a constant stream of nociceptive input that can, over time, contribute to central sensitisation. Those with hypermobility also have higher rates of autonomic dysfunction, mast cell activation, and small fibre neuropathy, all of which overlap substantially with fibromyalgia mechanisms.

Why does this matter practically? Because the treatment approach for someone with fibromyalgia and hypermobility looks different from fibromyalgia alone. Stability-focused movement, proprioceptive training, and pacing strategies need to account for the joint instability that drives so much of the pain input. Our comparison of fibromyalgia and osteoarthritis is also useful for understanding how different structural drivers interact with central sensitisation.

If you have been told you are “just flexible” without proper investigation, it is worth asking whether hypermobility is part of your picture. The two conditions are frequently co-present, frequently under-diagnosed together, and best addressed together.

→ Read our comparison of fibromyalgia and osteoarthritis

Pacing is the art of managing your activity levels to avoid the boom-bust cycle that affects so many people with fibromyalgia. You feel relatively okay, do a lot, crash hard, spend days recovering, feel okay again, repeat. Over time, this cycle can actually worsen sensitisation and reduce functional capacity.

When it comes to self-management, pacing is probably the most important practical skill, more impactful than any single medication or therapy. The goal is to stay within your “energy envelope” consistently, gradually expanding that envelope over time rather than exceeding it on good days and paying the price for it. Our complete evidence-based guide to pacing covers this in significant depth.

CO2 Tolerance and Breathing

One often-overlooked aspect of fibromyalgia self-management is breathing mechanics and CO2 tolerance. Chronic dysregulation of breathing, including habitual overbreathing, can maintain and worsen the sympathetic nervous system activation that drives fibromyalgia symptoms. Improving CO2 tolerance through specific breathing practices can have downstream effects on pain, fatigue, and nervous system regulation.

We have gone into detail on CO2 tolerance, breathlessness, and chronic pain. It is a genuinely important piece of the puzzle that is largely absent from standard fibromyalgia guidance.

Grounding and Earthing

Grounding (direct physical contact with the earth’s surface) has generated some interest as a low-cost adjunct for fibromyalgia. The evidence is preliminary but not without signal. Some studies suggest effects on inflammatory markers and sleep quality. We have reviewed what the research actually shows in our piece on grounding and earthing for fibromyalgia.

→ Read the complete evidence-based guide to pacing

The question “can your brain make you sick?” is one that gets asked a lot, sometimes accusatorially, as if it means the illness is not real. But the science gives a more interesting answer than the question implies.

The brain absolutely influences pain experience. That is not controversial. It is neuroscience. The pain you feel is constructed by your nervous system based on an interpretation of incoming signals, context, threat assessment, and past experience. In fibromyalgia, this interpretive process has been recalibrated toward threat and amplification [8].

What is crucial to understand is that this is not the same as saying fibromyalgia is psychological, imaginary, or chosen. Central sensitisation is a physical change in the nervous system. The altered brain activation patterns seen on fMRI in fibromyalgia are real, measurable, and distinct from healthy controls. The brain changes that accompany a history of childhood adversity are real, structural, and long-lasting [15].

Understanding the brain’s role in fibromyalgia is actually useful, not dismissive. It opens up approaches to recovery that go beyond medication. Neuroplasticity means the brain can change. Therapies that target the nervous system’s threat processing (including certain movement approaches, breathing practices, and psychological therapies) can produce real changes in pain and function. We have explored the question of whether your brain can make you sick in a dedicated piece.

→ Read our piece on whether your brain can make you sick