Fibromyalgia: the pain is real, and it is made by a nervous system that can relearn.

Decades of searching for damage in the muscles found nothing. The explanation was in the brain all along, and that is hopeful.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What fibromyalgia is

Fibromyalgia is a condition of widespread pain, meaning pain on both sides of the body, above and below the waist, lasting at least three months. Muscles feel sore, stiff and tender, and the pain often shifts from day to day. Nearly everyone with it also has deep fatigue, sleep that does not refresh, trouble with memory and attention, and heightened sensitivity to noise, light, cold or touch. Headaches, irritable bowel, bladder irritability, jaw pain and low mood are common companions.

It affects around 2 to 4 percent of people, more often women, and often starts after an illness, injury, surgery or a period of severe stress, though it can begin gradually. Diagnosis is clinical: a doctor confirms the pattern and rules out conditions that can look similar, such as rheumatoid arthritis, lupus, underactive thyroid, polymyalgia and vitamin D deficiency. There is no blood test or scan for fibromyalgia itself, because there is nothing wrong with the tissue being scanned.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms takes a firm position. It says there is no good evidence that fibromyalgia is caused by a structural disorder of the body; that many attempts to find such evidence have failed under careful scrutiny; and that when autoimmune, hormonal and peripheral diseases have been excluded and the diagnosis is confirmed, the symptoms should be attributed to neuroplastic symptoms. In other words, fibromyalgia is not a condition that neuroplastic symptoms occasionally contribute to; in the index's view it is one.

Neuroplastic symptoms are real symptoms produced by learned patterns in the brain and nervous system, an alarm system that has become sensitized and now fires in response to ordinary signals, rather than by ongoing injury or disease. They are not imaginary, not a weakness, and not "all in your head" in the dismissive sense. The brain is the organ that produces every pain you have ever felt; in fibromyalgia it has learned to produce pain without a tissue reason. Because the brain learns, it can unlearn.

The scientific name for this is nociplastic pain, the third category of pain alongside nociceptive (from tissue) and neuropathic (from nerve damage); see our explainer on the three types of pain. Fibromyalgia is the textbook example. The process that underlies it, central sensitization, turns up the gain on incoming signals and turns down the brain's own pain-dampening system. That explains why everything hurts, why touch and noise feel too much, and why fatigue, fog and gut symptoms come along: the same sensitized system runs them all.

What the research shows

Fibromyalgia is one of the best-studied examples of pain driven by the central nervous system, and the research covers both mechanism and treatment.

A 2026 review of central sensitization and nociplastic pain across fibromyalgia, osteoarthritis and inflammatory arthritis described the shared biology: reduced inhibitory signalling, elevated glutamate that tracks with symptom severity, and raised substance P in cerebrospinal fluid, together indicating excitable pain circuits. A short review of descending pain modulation in fibromyalgia added that the brainstem and cortical circuits that normally dampen pain are under-active, so ordinary signals are not filtered as they should be.

Not every researcher agrees that the periphery plays no part. A 2026 review titled Fibromyalgia: A Multifactorial Pain Disorder argues that peripheral nerve changes may help sustain the central process in some people. That debate is live, but the point of agreement is strong: the pain in fibromyalgia is amplified and maintained by the central nervous system, which is what the ATNS index means by neuroplastic.

Treatment research fits this picture. A cluster-randomized trial of 230 adults with fibromyalgia compared emotional awareness and expression therapy, cognitive behavioral therapy and education. The emotional approach did not beat education on the main pain measure, but it did better on several secondary outcomes, and compared with CBT more people reached a 50 percent drop in pain (about 23 versus 8 percent).

Signs the brain may be part of the picture

• Pain is widespread and moves around rather than staying in one injured spot.
• Light touch, noise, bright light, cold or strong smells feel overwhelming.
• Fatigue, poor sleep, fibro fog, IBS, bladder urgency, headaches or jaw pain travel with the pain.
• Symptoms flare with stress, poor sleep, conflict or overdoing it, and ease with absorbing activity or rest in a safe place.

A solution that addresses it

Because fibromyalgia is a sensitized-nervous-system condition, the approaches that help are the ones that retrain the system. Pain and symptom reprocessing combines education about neuroplastic pain (so the pain stops feeling dangerous), somatic tracking (attending to sensations with curiosity rather than fear), reducing threat and protective behaviour, graded return to movement and life, emotional awareness and expression, and acceptance and commitment skills. Delivered by trained clinicians, and increasingly through digital programmes, it works alongside the gentle aerobic exercise and sleep care that fibromyalgia guidelines already recommend.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. If that is you, join the waitlist.

What to do next

Confirm the diagnosis properly. Ask your doctor to rule out the look-alikes: inflammatory arthritis, lupus, thyroid disease, polymyalgia, vitamin D deficiency, sleep apnoea. Seek prompt care for red flags such as joint swelling, fever, unexplained weight loss, progressive weakness or numbness.

Then accept the diagnosis as a nervous-system one. This is the step many people skip. Fibromyalgia is not a mystery illness with no explanation; it is the clearest example of neuroplastic pain. Read why hurt is not harm.

Then start retraining. Our in-depth guide to fibromyalgia and ACT walks through the skills, and the condition index covers the overlapping diagnoses (ME/CFS, IBS, central sensitization syndrome) that often share the same root.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.