Fibromyalgia affects muscles and their attachments to bone. It results in widespread pain and tender points, which are certain places on the body that are more sensitive to pain. It also may result in fatigue, disturbed sleep, stiffness, and sometimes psychological distress. Fibromyalgia affects mostly women. It is common and often misdiagnosed. Treatments include exercise, relaxation techniques, pacing your activities, and self-help skills.