Nowadays, many young people suffer from shoulder pain and often take painkillers on their own, believing that frozen shoulder is a patent disease of the elderly and that young people do not suffer from frozen shoulder. However, when shoulder pain occurs, if not treated in time, it may further develop into frozen shoulder, affecting daily life and sports and reducing the quality of life. The shoulder joint has the largest range of motion of any joint in the body and can move in three planes in three dimensions. The bony structure of the shoulder joint is an unstable structure, and its stability is mainly maintained by the rotator cuff around the shoulder joint, which also relies on the pull of the rotator cuff muscles during shoulder movement. There are numerous tendon attachment points around the shoulder joint. When the shoulder joint is actively moving, the muscles contract and pull on the tendons, which move together with the attached bones. There are three main causes of shoulder joint pain in young people: 1. Rotator cuff injury When the shoulder joint is subjected to excessive external forces or when the rotator cuff muscles contract violently and actively, this can lead to tears or even ruptures in the rotator cuff, glenoid lips, ligaments, etc. After these structures are damaged, it is difficult to heal on your own if they are not treated early or are not treated properly, thus causing chronic damage to the shoulder joint and local chronic inflammation. The pain is recurrent or persistent and affects the range of motion of the joint in severe cases. 2. Rotator cuff strain When the shoulder joint is in a certain position for a long time, it will lead to continuous tension in some muscles, resulting in continuous stretching of the tendon and the periosteum of the tendon attachment point, resulting in pain due to tendon degeneration and repeated stimulation of the periosteum of the tendon attachment point, resulting in inflammatory reactions and calcified deposits. After the tendon degeneration, the strength of the tendon decreases, resulting in instability of the shoulder joint, which will further accelerate the degeneration of the shoulder joint. 3. Shoulder joint degeneration Degeneration does not occur only in old age. Degenerative changes in the shoulder lock joint can occur as early as in the twenties, and can be characterized by loss of articular cartilage, subchondral bone sclerosis, and bone growth at the edge of the joint, which can produce symptoms such as pain and reduced joint range of motion. Therefore, for the above reasons, in order to prevent shoulder pain, we should do the following in our daily life and work: 1. Do a good warm-up and stretching exercise before exercise. The incidence of tearing or rupture is reduced. 2, avoid the shoulder joint for a long time in a position for the sedentary office white-collar workers, especially the long time use of the mouse, the shoulder is often prone to recurrent pain. When continuing to use the mouse, the need for the shoulder on the muscle, large round muscle, small round muscle contraction sustained maintenance, so that the tendons of these muscles are subject to continuous strain, resulting in its easy to produce inflammatory edema, degeneration, exudation and other pathological changes, and even adhesions and cause pain and activity restrictions. Therefore, for people like the mouse family who need the shoulder joint to be in a certain position for a long time, they should regularly carry out activities and stretching of the shoulder joint in all directions, so that the muscle contraction and relaxation alternately, to avoid continuous stretching of the tendons. 3.Balanced exercise for all directions of the shoulder joint The shoulder joint can only move stably in all directions if the shoulder muscles are balanced. If the strength of the shoulder is not balanced, the weaker parts of the shoulder will be stretched excessively, resulting in uneven stress on the shoulder joint, leading to arthritic changes such as degeneration and damage to the articular cartilage and glenoid lip. In addition, when there is pain in the shoulder, you should not just take painkillers. Especially for patients with shoulder pain caused by shoulder trauma or sports injuries, when the shoulder pain occurs, there may already be damage to the rotator cuff or the glenoid labrum or ligaments of the joint, so after taking painkillers to relieve the pain, continuing to overactivate the shoulder joint will further aggravate the original injury. The blood supply to the upper part of the glenoid labrum and the anterior upper part of the shoulder joint is less than that to the posterior and inferior parts, resulting in easy necrosis of the upper part of the glenoid labrum after injury. After glenoid labrum necrosis, the stability of the shoulder joint is damaged and the proprioceptive afferents are also damaged, which can be restored only after the glenoid labrum is repaired. Therefore, young people with shoulder pain should not take it lightly. They should go to a joint specialist or a sports medicine specialist as soon as possible to avoid further damage to the shoulder joint through examination, treatment and activities under the guidance of a specialist.