A ringing sound in the shoulder when the arm is turned may be related to the following causes: 1. It may be caused by prolonged braking. This condition is often seen when the patient has to sit and stand for a long time and work with his head down. At this time, if the shoulder joint is cold, it is very easy to cause muscle spasm in the shoulder. If the patient does the rotational activities of the shoulder joint, the tendons will slip around the bony prominence of the shoulder joint and produce a popping sound. 2. There may be frozen shoulder. This is often seen when a patient has had a trauma or cold in the shoulder joint, resulting in a sterile exudate inside the shoulder joint. In this case, there is significant pain and severe limitation of movement in the shoulder joint. There may also be a distinctive ringing in the shoulder joint when the patient moves. 3. It may be caused by trauma to the shoulder joint. If the patient has had a dislocation, fracture or soft tissue contusion of the shoulder joint in the past, then after recovery, the shoulder joint may have a strange sound during movement. 4. This may be caused by a lack of muscle strength around the shoulder joint. At this time, if the shoulder joint then goes to do a relatively large range of activities, then it will produce a strange sound during the sliding process of the shoulder joint.