Fibromyalgia is a chronic illness. It is classified as a chronic primary pain condition by the World Health Organization’s international disease coding system (ICD-11), and the CDC lists it under chronic diseases. There is no cure, and for most people, symptoms persist for years or a lifetime, though their severity can fluctuate over time.
How Fibromyalgia Is Classified
In the ICD-11, fibromyalgia falls under the code MG30.01, “chronic widespread pain,” which sits within the broader category of chronic primary pain. This classification matters because it formally recognizes fibromyalgia as a long-term condition with its own biological basis, not simply a symptom of another disease or a psychological complaint. The CDC similarly categorizes it as a chronic disease, noting it affects about 4 million U.S. adults, roughly 2% of the adult population.
The Social Security Administration also recognizes fibromyalgia as a condition that can qualify as a medically determinable impairment for disability purposes, provided there is documented physician evaluation and evidence of persistent, widespread symptoms.
What Makes It Chronic
Fibromyalgia is rooted in how the brain and spinal cord process pain signals. In most people with the condition, the nervous system becomes hypersensitive to pain, a phenomenon sometimes called central sensitization. The underlying problem involves an imbalance in brain chemicals: levels of excitatory signaling molecules (the ones that amplify pain signals) are elevated, while levels of the chemicals that normally dampen pain, like serotonin and norepinephrine, are reduced.
There are also changes in how the brain’s own natural painkillers function, along with disruptions in dopamine activity. These aren’t temporary imbalances that resolve on their own. Genetic factors play a role as well. Research has identified patterns of gene activity, particularly in genes tied to stress response and the autonomic nervous system, that appear to set the stage for the condition. This combination of neurological and genetic factors is why fibromyalgia persists rather than resolving like an acute injury.
Symptoms Beyond Pain
Pain is the hallmark, but fibromyalgia affects far more than that. The condition commonly causes severe fatigue, unrefreshing sleep, and cognitive problems often called “fibro fog,” which can include difficulty concentrating, memory lapses, and mental sluggishness. Depression, anxiety, and irritable bowel syndrome frequently co-occur.
The pain itself can be widespread across the body or concentrated on one side, above or below the waist, or along the spine. It tends to wax and wane, with periods of relative calm interrupted by flares. This unpredictability is one of the most frustrating aspects of living with the condition.
How It Affects Daily Life
The impact on everyday functioning is substantial. In a large survey of people living with fibromyalgia, 55% said their pain limited daily activities by at least half. More than 70% reported a severe impact on their ability to do physical leisure activities and on their sleep quality. Among those who were employed, half had missed at least one day of work in the past year due to fibromyalgia pain, with the average total reaching about 32 missed days.
Relationships take a hit too. More than half of respondents said fibromyalgia pain had negatively affected their romantic relationships, and of those, 68% reported having to limit physical intimacy. Roughly half said their friendships, social lives, and family relationships had suffered as well. These numbers paint a picture of a condition that reaches into nearly every corner of a person’s life.
How It Is Diagnosed
There is no blood test or imaging scan for fibromyalgia. Diagnosis is based on a clinical evaluation where a physician assesses how many areas of the body are painful and how severe the accompanying symptoms are. The current criteria, updated in 2016 by the American College of Rheumatology, use two scales: one that maps how widespread the pain is across the body, and another that rates the severity of fatigue, cognitive symptoms, and unrefreshing sleep. A combination of high scores on either or both scales meets the diagnostic threshold.
Importantly, other conditions that could explain the symptoms, such as thyroid disorders, lupus, or rheumatoid arthritis, need to be ruled out first. This process can take time, which is one reason many people spend months or years before receiving a diagnosis.
Management, Not Cure
Because the condition is chronic, treatment focuses on managing symptoms rather than eliminating the disease. The European Alliance of Associations for Rheumatology (EULAR) bases its recommendations on over 100 reviews and meta-analyses, and the approach is multidisciplinary, meaning it typically involves more than one type of care.
Exercise, particularly aerobic activity and strength training, consistently shows the strongest evidence for reducing pain and improving function. Cognitive behavioral therapy and other psychological approaches help with the mental health burden and with developing strategies for flares. About 75% of people with fibromyalgia use at least one medication to manage symptoms, and most people rely on a primary care physician as their main point of contact, though rheumatologists and pain specialists are also commonly involved.
The goal of management is to reduce the frequency and severity of flares, improve sleep and energy, and help you maintain as much daily function as possible. Many people find that the right combination of physical activity, stress management, and sometimes medication brings symptoms to a level where life feels more manageable, even if the condition itself never fully goes away.