what is fibromyalgia +12 fibromyalgia /ˌfʌɪbrə(ʊ)mʌɪˈaldʒ(i)ə/ Fibromyalgia Symptoms and DiagnosisFibromyalgia is a chronic disorder characterized by widespread musculoskeletal pain, fatigue, sleep disturbances, and cognitive issues ("fibro fog"). It is believed to be caused by the ne