Shoulder pain can be caused by sports or other injuries when joints, muscles or ligaments become inflamed. Some people even blame their shoulder (or other joint) problems on "old age", even though their other shoulder, which doesn't have any problems, is just as old. 

Most problems with the shoulder usually originate in the cervical spine, as the nerves from this area intersect all of the muscles and other tissues of the shoulder, as well as the arm and hand. If these nerves get irritated, the shoulder muscles can become tight or weak causing dysfunction in the normal mechanics of the joint, especially in the rotator cuff. Overuse of the shoulder in sports can cause the same affect. Poor posture, sitting too much in a slouched position or with the shoulders held forward are also at risk.When ligaments and tendons of the glenohumeral joint get so irritated, they can cause adhesions making the joint stick together. The result is that the individual experiences limited shoulder motion and pain that makes it difficult to get dressed, or groom their hair. If left untreated this "frozen shoulder" can take several years to resolve and therefore needs professional attention by a Chiropractor.