Fibromyalgia may often cause “invisible” symptoms, such as sleepiness and migraine. Sometimes, though, fibromyalgia may cause visible skin symptoms, like rash. It’s not easy to spot fibromyalgia. This ...

It's not clear exactly what causes the pain of fibromyalgia, but it may have something to do with how your body sends and receives pain signals. (Photo Credit: E+/Getty Images) Fibromyalgia is a ...