For the causes of the shoulder ringing when moving are as follows: 1. Synovial hyperplasia: If there is more synovial hyperplasia in the shoulder joint, it will cause the synovial membrane to collide with the cartilage of the humerus, so there will be a ringing sound when moving, which often does not cause pain when ringing occurs. 2. Degenerative disease of the shoulder joint: Mostly seen in middle-aged and elderly people, due to the wear and tear of the articular cartilage and loss, the friction between the joints will increase. In this case, the stress between the humerus and the glenoid in particular is concentrated, and there is a bone friction sound when moving the joint, so there will be a ringing sound. In the case of osteoarthritis, the ringing is often accompanied by joint pain.