The Story Behind Fibromyalgia
Fibromyalgia has one of the most fascinating and misunderstood histories in all of medicine. For decades it was doubted, dismissed, and even blamed on patients. Today, we understand it far better than we ever have. Here is the story of how our thinking evolved, what the science now tells us, and what you should do if you think you might have it.
What is fibromyalgia?
Fibromyalgia is a condition of chronic, widespread pain. It is often accompanied by other symptoms, including:
Poor or unrefreshing sleep
Fatigue
Depression and anxiety
Problems with memory and concentration ("brain fog")
Heightened sensitivity to lights, noises, and odors
How common is it, and who does it affect?
Fibromyalgia affects roughly 4–6% of people in the United States, with a similar rate around the world. It affects women about 1.5 to 2 times more often than men, which is similar to many other chronic pain conditions.
Why was it once called "fibrositis"?
Decades ago, fibromyalgia was called "fibrositis" because doctors assumed it was driven by inflammation in the body's tissues. (The suffix "-itis" means inflammation.)
Over time, careful research showed there was no detectable inflammation in the tissues. Because of this, the name was changed to fibromyalgia, which simply describes pain in the muscles and soft tissues without implying a cause that was never found.
Is fibromyalgia an autoimmune disease?
No. This is one of the most important myths to clear up. Fibromyalgia is not an autoimmune disease, and it is not treated with immune-suppressing medications. Even recent large-scale genetic research supports the conclusion that fibromyalgia is not primarily an autoimmune disorder.
Why did so many people once doubt fibromyalgia was "real"?
For many years, because there was no visible tissue damage and no abnormal lab test to point to, some people questioned whether the condition was legitimate at all. Patients were too often told the pain was "all in their head."
So what does the science actually show?
This is the most important part of the story. Over the last 20 years, a large body of research has revealed real, objective changes in the nervous system in people with fibromyalgia. It is not "just in your mind."
The evidence became so strong that the International Association for the Study of Pain formally recognized that pain can arise from the central nervous system (the brain and spinal cord), even with little or no signal coming from the body's tissues.
What is "nociplastic pain"?
This brain-and-spinal-cord type of pain is called nociplastic pain. In fibromyalgia, the central nervous system becomes hyperresponsive — it is turned up too high.
This means the brain and spinal cord become oversensitive to both painful and non-painful signals. It is why everyday sensations — a firm touch, bright lights, loud sounds — can feel amplified or even painful. This "volume turned up too high" wiring is thought to explain many of the symptoms of fibromyalgia.
Why does understanding nociplastic pain matter for treatment?
Because it changes the entire goal of therapy.
If the problem were damaged tissue, the goal would be to "fix" that spot. But in fibromyalgia, the goal is to calm the oversensitive nervous system that is generating amplified pain — not to chase and repair a peripheral injury that isn't there. This is why treatments that act on the nervous system, along with exercise, better sleep, and stress management, tend to be more helpful than treatments aimed only at the muscles or joints.
Why does fibromyalgia often show up alongside diseases like rheumatoid arthritis or lupus?
Rheumatologists frequently see fibromyalgia occurring together with inflammatory diseases such as rheumatoid arthritis or lupus. In fact, fibromyalgia can be present in up to about a third of people with lupus.
One leading explanation is the "bottom-up" process. The idea is that years of repeated painful signals — for example, from inflamed joints in a rheumatologic disease — can gradually train the central nervous system to become hypersensitive. Over time, the nervous system starts to amplify and prioritize pain, responding strongly to both painful and non-painful signals. Importantly, this means a person can have both an autoimmune disease and fibromyalgia at the same time.
How is fibromyalgia diagnosed today?
The way we diagnose fibromyalgia has changed significantly.
The old way (1990): The first criteria required widespread pain plus 11 of 18 "tender points" on physical exam. This method is no longer used.
The modern way (2016 American College of Rheumatology criteria): Doctors now look for pain in multiple body sites across at least four of five body regions, combined with a Fibromyalgia Severity Score. This score accounts for other centrally driven symptoms such as fatigue, sleep problems, and mood.
Is there a blood test for fibromyalgia?
No single test can diagnose fibromyalgia. However, lab work is still important. Doctors often order comprehensive labs — not to confirm fibromyalgia, but to screen for other conditions that can look similar, especially inflammatory and autoimmune diseases and thyroid problems.
What should I do if I have chronic, widespread pain and think it might be fibromyalgia?
Get evaluated. Start with your primary care doctor or a rheumatologist.
Expect a thorough workup. A careful evaluation is needed both to confirm the diagnosis and to rule out other conditions that can mimic it. Remember, some people have fibromyalgia and another condition at the same time.
Be your own advocate. You do not have to simply live with unexplained pain.
The Bottom Line
Fibromyalgia is a real, well-documented condition with measurable changes in how the nervous system processes pain. We understand it far better than we did a generation ago, even though important questions about treatment remain.
You do not have to suffer in silence. Seek help, advocate for yourself, and build a healthcare team that supports you — so you can get the care you deserve.
Additional reading:
Williams DA, Clauw DJ. "Fibromyalgia." New England Journal of Medicine, 2026.