Shoulder pain is not a specific diagnosis. It is a general term to denote an area from which the individual reports their symptoms. They may arise from the shoulder joint itself or from any of the many surrounding structures, muscles, ligaments and/or tendons. Shoulder pain that usually worsens with activities or movement of your arm or shoulder generally comes from the joint. Shoulder pain is a very common complaint and it constitutes 16% of all musculoskeletal system complaints reported in physical therapy. For more specific possible and common causes of Shoulder Pain, see: Shoulder Impingement; Frozen Shoulder; Thoracic Outlet Syndrome.