&Fibromyalgia Syndrome=Fibromyalgia is a common cause of chronic musculoskeletal pain. The cardinal manifestation of fibromyalgia is diffuse musculoskeletal pain. Although the pain may initially be localized, often in the neck and shoulders, it eventually involves many muscle groups. Patients typically complain of axial pain in the neck, middle, and lower back, and pain in the chest wall, arms, and legs. The pain is chronic and persistent, although it usually varies in intensity. Patients often have difficulty distinguishing joint and muscle pain. The joints do not appear swollen or inflamed on examination. Pain is often aggravated by exertion, stress, lack of sleep and weather changes. Sensations of numbness, tingling, burning, is often described. Fatigue is present in more than 90 percent of cases and is occasionally the chief complaint. Most patients report sleep difficulties.