The sound of the shoulder moving may be due to the following reasons: 1. It may be caused by frozen shoulder. This kind of disease is often due to the patient’s shoulder having a long-term cold, or keeping a certain posture fixed for a long time, causing a sterile inflammation inside the shoulder joint over time. This may be caused by tendon damage inside the shoulder joint. For example, if the patient has a rotator cuff injury inside the shoulder joint, or if there is damage to the tendon stop, there will be a tendon noise when moving the shoulder. 3. It may be caused by the presence of an old fracture in the shoulder. For example, if the patient has a previous fracture of the acromion, greater tuberosity, humeral head, or humeral neck, small fracture fragments may appear in the shoulder. When the patient moves the shoulder, there may be an abnormal collision, which in turn may lead to a strange sound. Finally, it may also be caused by instability of the shoulder joint. For example, if the patient has had a severe shoulder dislocation or fracture in the past, after he or she recovers, there may be instability in the shoulder, followed by a strange noise when the patient moves the shoulder.