Fibromyalgia is a chronic pain disorder characterized by widespread musculoskeletal pain, along with fatigue, sleep disturbances, and increased sensitivity to touch. It is believed to be caused by abnormal processing of pain signals in the brain and nervous system, which amplifies how the body perceives pain. The condition does not cause visible damage to joints or tissues, but it can significantly affect daily functioning and quality of life. It is more common in women and may be triggered by physical trauma, stress, infections, or other medical conditions.