Scapular thumping may be caused by physiological factors, frozen shoulder, subacromial impingement and other factors. 1. Physiological factors: keep a posture for too long, long time no activity, suddenly move the shoulder area, there will be scapula thumping symptoms, only occasionally, no other clinical manifestations, do not need special treatment. 2. Frozen shoulder: it may be related to chronic strain injury, localized aseptic inflammation of the scapula, when moving the shoulder, there will be symptoms of thumping and thumping, and it may be accompanied by pain, activity limitation and other symptoms. 3. Subacromial impingement sign: it may be related to prolonged heavy physical labor or strenuous exercise, when the shoulder joint carries on the activity, the symptom of scapular thumping will appear, which may be accompanied by shoulder pain, and when it is serious, it will lead to the restriction of shoulder activity. Scapular thumping and other abnormal manifestations, excluding physiological factors, it is recommended to seek medical examination and treatment to avoid delaying the condition.