Rotational clicking at the shoulder joint can be caused by physiological reasons, frozen shoulder, osteoarthritis of the shoulder joint, shoulder joint injury and other reasons. 1. Physiological reasons: the structure of the shoulder joint itself is relatively closed, and when the shoulder joint is intensely active, it can cause clicking sound due to the drastic change of pressure inside and outside the joint cavity. 2. Frozen shoulder: when inflammation occurs around the shoulder, it can cause hypertrophy and hyperplasia of tendons, ligaments, joint capsule and other soft tissues, etc. When the shoulder joint is active, the hyperplasia tissue rubs against the bone at the shoulder joint and produces a clicking sound. 3. Osteoarthritis of shoulder joint: due to degenerative changes of shoulder joint or traumatic arthritis caused by trauma, it can lead to proliferation and deformation of bone at shoulder joint, and when the shoulder is moving, it can produce clicking sound due to friction and impact of bone. 4. Shoulder joint injury: injury to the glenoid labrum of the shoulder joint or rupture of tendon ligaments may be accompanied by clicking sound during joint activities. When the shoulder joint clicks, it is necessary to consult a doctor in time, so that the specialist can clarify the condition and carry out appropriate treatment, which will help to alleviate the uncomfortable symptoms as soon as possible.