The inability of the arm to go backward is considered to be related to frozen shoulder, rotator cuff injury, degenerative disease of shoulder joint, etc. Magnetic heat therapy, exercise rehabilitation, surgery and other treatments can be given. 1. Frozen shoulder: If there is frozen shoulder, it is easy to cause pain in the shoulder joint and limitation of movement, so the phenomenon of not being able to move the arm to the back can be treated by shockwave with magnetic heat therapy. 2. Rotator cuff injury: in the part of shoulder joint, if the rotator cuff injury is caused by improper exercise or excessive force, it is easy to affect the range of motion of shoulder joint, so the phenomenon of not being able to carry the arm to the back is produced, and it can be considered to be repaired by sports rehabilitation or shoulder arthroscopy. 3. Degenerative lesions of shoulder joint: If degenerative lesions of shoulder joint occur, it will easily affect the bony structure of shoulder joint, thus producing the phenomenon that the arm can not be carried backward, and it can be considered to be restored quickly through the methods of exercise stretching and joint loosening. Normally in the process of exercise, pay attention to do a good job of warming up activities, do not violently pulling the arm, otherwise it is easy to lead to soft tissue damage, thus aggravating the symptoms of joint pain and swelling, will also affect the later recovery. Related patients are advised to seek timely medical examination to clarify the cause of the disease and targeted treatment.