For a long time, due to misconceptions about shoulder injuries, people are used to classifying many shoulder-related diseases as “frozen shoulder”, not knowing that there are many diseases that can cause shoulder joint pain, and rotator cuff injuries are the most common. Rotator cuff injuries account for 30-40% of shoulder joint disorders. It is a very common degenerative disease of the shoulder joint, and its occurrence is positively correlated with age. Typical symptoms are pain in the neck and shoulder at night and pain in the arm when lifting; sometimes you are afraid to sleep on the side of pain or even wake up with pain; the shoulder joint may be weak during abduction, supination or posterior extension, and sometimes there are difficulties even in self-care. Shoulder impingement is a condition in which the acromion and subacromial bursa tissues collide with rotator cuff tissues during shoulder abduction and supination, resulting in shoulder pain and supination dysfunction. In general, impingement and rotator cuff lesions occur more often in older individuals and throwing athletes. If treatment is delayed, the patient may experience severe muscle atrophy and sleepless nights; if left to develop, it may lead to rupture of important tendons in the shoulder joint at a later stage, seriously affecting the patient’s function and life. Shoulder instability The third most prevalent shoulder joint disorder is shoulder instability. Due to trauma or degeneration of the joint structure, as well as the high mobility and relatively poor stability of the shoulder joint itself, the shoulder joint is prone to dislocation or subluxation. If left untreated, bone loss and destruction of the joint surface can occur, making later treatment difficult and in some cases, even tricky. In addition, there are many other diseases of the shoulder joint, such as acromioclavicular arthritis, biceps tendonitis and calcific supraspinatus tendonitis. The appropriate treatment should be taken for the different diseases. Conservative treatment includes: rest; NSAIDs for pain relief; corticosteroid intra-articular injections; ultrasound for synergistic effect of medication and thermal effect with adjunctive therapy; and functional exercises for the shoulder joint. If conservative treatment is ineffective, surgical treatment can be considered. For example, rotator cuff injury can be treated by shoulder arthroscopy or minimally invasive surgery combining shoulder arthroscopy and small incisions; severe rotator cuff injury requires open surgical reconstruction or shoulder joint artificial joint replacement.