Fibromyalgia, also called fibromyalgia syndrome, is a long-term condition which causes pain all over the body. Fibromyalgia causes widespread pain and extreme tiredness. Around 1 in 25 of the UK population has fibromyalgia, a lifelong condition involving widespread musculoskeletal pain and tenderness, fatigue, sleep disturbance, and functional impairment, without any known structural or inflammatory cause. What causes fibromyalgia? The exact causes are not known, but there ar