A condition that is characterized by chronic pain in tendons, ligaments and muscles surrounding joints. Other symptoms include muscle spasms, fatigue, stiffness, abnormal sleep patterns with unrefreshing sleep, headaches and, occasionally, depression. There is significant overlap with chronic fatigue syndrome (CFIDS) in which fibromyalgia may arise as a secondary disease process. The cause of the condition is unknown.
The above terms and definitions are part of the Taxonomy of Human Services, used here by permission of INFO LINE of Los Angeles.