May be due to the following reasons lead to one side of the clavicle more prominent symptoms: 1, the most common can appear on one side of the clavicle protruding reason is the daily work labor or habitual action caused by the thoracic force imbalance, the clavicle and the sternum and shoulder joint connection, is through the joint capsule and the surrounding fascia, ligaments and other soft tissues to connect each other. When the usual habitual use of one side of the arm, the force is also very large, such as shot put, discus, javelin throwers or special occupations, may cause structural changes in the soft tissues around the clavicle joint. Long-term power imbalance, will inevitably appear on one side of the clavicle protruding symptoms, but this situation will not have other manifestations, such as local pain or restricted activities and other symptoms of discomfort. 2, if in addition to one side of the clavicle protruding, accompanied by symptoms of pain, may be due to suffer from sternoclavicular joint arthritis or periarthritis of the shoulder joint pain caused by the activity of the affected side of the shoulder, shrugged shoulder movement when the discomfort of pain. The pain and discomfort will occur when you move the affected shoulder or do shrugging movements.