The shoulder joint is the largest joint in the body in terms of range of motion, but it is also the most unstable joint. Under normal circumstances, the shoulder joint can be moved forward, upward, abducted, adducted and extended. However, with a high degree of shoulder mobility, the shoulder joint is also more prone to injury and instability. Some occupations are also closely related to shoulder disorders, such as glass wall cleaning, gardening, swimming, tennis and weightlifting, especially throwing athletes are more prone to shoulder injuries. In addition, with age, aging degenerative disease of the shoulder joint in middle-aged and elderly people also causes shoulder pain, and when accompanied by a history of trauma, the pain increases, as in the case of Ms. Li, who already had degenerative changes in the shoulder joint and was injured by someone hitting the shoulder joint, the pain was prolonged and repeated, but the treatment was not effective. The shoulder joint has a complex structure, consisting of the acromioclavicular joint, the glenohumeral joint and the rostral shoulder arch located on it. The rotator cuff is a group of muscles and tendons that are connected to the upper arm and scapula. The rotator cuff covers the shoulder joint and the joint capsule, stabilizing the shoulder joint. The rotator cuff allows the body to lift the arm, touch things overhead, and participate in activities such as throwing and swimming. The bursa covering the rotator cuff and the scapula can secrete synovial fluid when the body moves, thus playing a role in lubrication. Rotator cuff injuries include rotator cuff injuries, impingement syndrome, and shoulder instability. Rotator cuff injuries are the most common of the shoulder injury disorders, especially in people over 40 years old, and the main causes are degenerative changes (also known as aging), impingement, and trauma. It is estimated that more than 4 million people in the United States seek medical attention for shoulder problems each year. Trauma and repetitive excessive upper arm movements can cause rotator cuff injuries. It is important not to take shoulder pain and limited motion for granted, but rather to diagnose and treat the problem promptly. If the symptoms are not serious, conservative treatment can be started, including local medication closure, physical therapy, proper physical rehabilitation under the guidance of a rehabilitation doctor, and oral anti-inflammatory and pain-relieving medication. Patients can take a shower every day at home, and the best way is to take a hot bath on the affected area for 15 minutes, or insist on applying hot and wet compresses on the affected area every day; ointments can also be applied on the affected area, but special care should be taken not to cause skin allergy. In the hot summer, it is especially important to remind that if you are in a cold air-conditioned room, you should be careful not to turn the air conditioning temperature too low, and pay attention to the affected area to keep it warm and not to suffer from wind and cold. For example, when wiping the window glass at home, you can operate at intervals with other hygiene and cleaning work, and after wiping two pieces of glass, you can sweep the floor instead, which can reduce excessive rotator cuff strain. Most patients will have their symptoms reduced through conservative treatment, but if systematic conservative treatment does not work, surgery can be performed according to the patient’s specific situation. Currently, it has become an orthopedic trend to perform rotator cuff repair surgery arthroscopically, using several small incisions to reattach the ruptured tendon to the greater tuberosity of the humerus arthroscopically. Arthroscopic surgery is rapidly developing because of the aesthetic incision, small trauma, clear vision and fast recovery. After surgery, with reasonable rehabilitation exercises, the function of the shoulder joint can be restored and the quality of life can be significantly improved. However, the condition is miscarried, the rotator cuff injury is too large, too much retraction, large bone defects exist, and serious joint destruction requires open surgery, and in some cases, due to missed rotator cuff repair opportunities or even replacement of artificial joints to partially solve the shoulder joint problems, which brings unnecessary pain to the patients. Therefore, we should update the concept of understanding shoulder joint diseases, improve the level of shoulder joint diagnosis and treatment, so that the shoulder that cannot be lifted can be lifted again.