Shoulder pain in boxing is considered to be caused by shoulder muscle strain, shoulder impingement syndrome or tendonitis. 1. Shoulder muscle strain: due to strenuous activities during boxing, it is easy to cause shoulder muscle and other soft tissue strain, damage to the shoulder muscles and ligaments, resulting in shoulder pain. 2. Shoulder impingement syndrome: If in the process of boxing, the acromioclavicular growth and rotator cuff have impact, thus causing injury to the supraspinatus tendon, resulting in shoulder impingement syndrome, the patient will also show the symptoms of shoulder joint pain, shoulder joint activities are limited. 3. Tendonitis: if the patient suffers from shoulder tendonitis, in boxing and other strenuous activities, will also stimulate and induce shoulder pain symptoms, resulting in obvious pressure pain, rebound pain and other discomforts, so boxing shoulder pain may also be a manifestation of tendonitis. As there are more causes of boxing shoulder pain, it may also be shoulder joint fracture or joint dislocation, and so on. When the patient appears related discomfort symptoms, should stop boxing activities, if through conservative management can not effectively improve the discomfort symptoms, it is recommended to go to the hospital in time to check the diagnosis, as soon as possible to clarify the cause of the disease to take targeted treatment.