Subacromial bursitis is caused by too much activity in the shoulder joint, resulting in too much impact and stimulation of the bones under the acromion and the shoulder joint, producing a kind of sterile inflammation. If the lesion itself is relatively mild now and the symptoms are not obvious, it can slowly heal itself over time by reducing the activity and avoiding the stimulation itself. However, if the disease is not systematically maintained and there is still excessive activity in the shoulder joint, it is unlikely to heal on its own. Even if the symptoms can gradually decrease over time, it is difficult to disappear on its own, and even in particularly severe cases of repeated irritation, repeated edema of the bursa may affect the movement of the joint and may require simple surgery to remove it in order to relieve the clinical symptoms. The most common treatment is the use of creams or local closure with rest to solve the problem.