The causes of internal rotation of humerus include muscle tension and developmental asymmetry, trauma, etc. Corrective methods include physical therapy, muscle training, surgical treatment and so on. 1. Muscle tension: Improvement is mainly made by relaxing the tense muscles, such as through massage, acupressure, acupuncture, electrotherapy and other methods, so as to relax the tense muscles, in order to reduce the symptoms of internal rotation of the humerus. 2. Asymmetrical muscle development: training the weak muscle groups. (1) Internal rotation muscle stretching: anterior deltoid muscle stretching, pectoralis major muscle stretching, latissimus dorsi muscle stretching. (2) external rotation muscle training: the human body is in the side lying position, the waist and back in a straight state, tighten the abdomen, flexion of the elbow, the arm of the hand to do the internal rotation of the humerus (according to the situation of the above action can be done with the weight of the internal rotation). 3. Trauma: If trauma is the cause of the problem and the rehabilitation training is not effective, surgery can be used. In addition to the above methods, you can also change your postural habits to correct the problem. It is recommended to go to the hospital to identify the cause of the disease and give targeted corrective treatment measures.