The shoulder joint is the joint with the largest range of motion in the body, and there are many muscles around the shoulder joint, as well as the rotator cuff and periarticular ligaments, so there are many causes of pain around the shoulder joint. Some people say that shoulder joint pain may be due to myofasciitis of the trapezius muscle, or it may be due to pain in the deltoid muscle. Myofasciitis of the deltoid muscle, which is an injury to the soft tissues around the shoulder joint, is a common symptom of shoulder joint pain. The more common cause is frozen shoulder, which is also called frozen shoulder, and is an adhesive inflammation of the shoulder joint. It is also known as subacromial impingement syndrome, or subacromial bursitis, which occurs in the subacromial space and causes painful impingement of the bursa during the process of lifting the shoulder joint. Another common disease is the rotator cuff repair surgery, which is often done by sports medicine doctors, and is caused by rotator cuff tears or rotator cuff injuries. The rotator cuff is the four muscles that are important for stabilizing the shoulder joint. These four muscles stabilize the shoulder joint like a cuff, and if there is damage to these four muscles, there will be pain in the shoulder joint. In addition, if there is weakness in the shoulder joint and some movements cannot be done, an MRI should be done to determine if there is a problem and if there is a rotator cuff injury, a minimally invasive shoulder arthroscopy should be done to repair the rotator cuff.