Fibromyalgia is a chronic, long term condition that involves fatigue, and widespread muscle and joint pain. It affects the way the brain processes pain signals by amplifying the sensor signals, and people with it can be extremely sensitive to pain that wouldn’t typically affect others. The cause is unknown. Although it isn’t life threatening, it can be difficult to live with the chronic fatigue and pain. It can take quite a while to diagnose, and symptoms can come and go.