Shoulder joint clicking upon movement may be caused by physiological factors, or it may be the clinical manifestation of some diseases, such as glenoid labral ligament injury, chronic shoulder pain, arthritic changes, etc. 1. Physiological factors: when the shoulder is kept in one position for a long time, the pressure in the shoulder joint cavity changes instantly after sudden activity, and clicking may occur. 2. Glenoid labral ligament injury: When the shoulder is moved after glenoid labral ligament injury, the cartilage, synovium, joint capsule and tendons in the shoulder joint will rub together and produce a popping and clicking sound. Sometimes it will also jam the joint, which is manifested as pain in the deep part of the shoulder joint. 3. Arthritic changes: For example, osteoarthritis or rheumatoid arthritis, the joint surface is not smooth, and there is a feeling of friction or wrong movement of the joints when moving, and there is a clicking sound. There are many reasons for shoulder joint clicking, such as joint instability caused by repeated dislocation of shoulder joint or posterior instability with posterior subluxation, and popping sound after reset. If it cannot be relieved for a long time and physiological factors are excluded, timely consultation should be made and targeted treatment should be given after the cause is clarified by the doctor.