Fibromyalgia is a long lasting or chronic disorder that causes muscle pain and fatigue. In about 2% of the US population, it's probably very underdiagnosed. It's the most common cause of generalized musculoskeletal pain in women ages 20 to 55 as well. And it's overall more common in women. If you have certain diseases, you may be more likely to have fibromyalgia. An example of these diseases include lupus, rheumatoid arthritis, and spinal arthritis. If you have fibromyalgia, you may experience widespread pain or multi-site pain. Sometimes you may have two or more chronic pain conditions at the same time as well, such as chronic fatigue syndrome, endometriosis irritable bowel syndrome, or interstitial cystitis doctors don't know the exact cause of fibromyalgia. Researchers continue to study it. And I've suggested certain events that may contribute to its cause such as car accidents or other stressful or traumatic events, repetitive injuries, illnesses such as viral infections and other diseases can also cause the development of fibromyalgia. However, sometimes fibromyalgia can just develop on its own. Fibromyalgia tends to run in families and some scientists think that genes may also contribute or make you more likely to develop the condition.