Fibromyalgia is a mystery .. no one really knows yet what causes it. There are many opinion's from studies. Right now the feeling is a "glitch" in the central nervous system causing the brain to perceive pain differently than "normal" people perceive. I've lived with it for over 35 years. I had to quit working and go on disability (cause Fibromyalgia and arthritis). I've helped lead a local Fibromyalgia Support group for the last 16 years.