Shoulder pain may arise from the shoulder joint itself or from any of the many surrounding muscles, ligaments or tendons. Shoulder pain that comes from the joint usually worsens with activities or movement of your arm or shoulder.
Various diseases and conditions affecting structures in your chest or abdomen, such as heart disease or gallbladder disease, also can cause shoulder pain. Shoulder pain that arises from another structure is called referred pain. Referred shoulder pain usually doesn't worsen when you move your shoulder.