There is a ringing sound when the arm moves, common degenerative osteoarthritis, shoulder joint instability several causes, as follows: a. Degenerative osteoarthritis: degenerative osteoarthritis of the elbow joint, joint surface cartilage rough wear, in the joint activity will appear ringing, and accompanied by joint pain as well as joint activity is limited, in severe cases the patient can not straighten, take an X-ray will find the elbow joint gap narrowing, and MRI will find MRI will reveal extensive damage to the articular cartilage. Shoulder joint instability: If the shoulder joint is congenitally unstable or if the shoulder joint is habitually dislocated, there will be a ringing sound when the arm is moved and there will be pain in the shoulder. Therefore, if a rattle occurs when the arm moves, it should be diagnosed and treated promptly in order to completely relieve the clinical symptoms. Normally, the muscle strength training of the shoulder and elbow should also be strengthened to stabilize the joint.