Frozen shoulder, adhesive capsulitis and frozen shoulder are also known as frozen shoulder, and in Chinese medicine, it is called frozen shoulder. When we encounter shoulder pain or limited movement of the shoulder joint, we are usually referred to as having frozen shoulder. According to the American Sports Medicine Association, frozen shoulder is a self-limiting disease that is actually a form of adhesive capsulitis. There is still a great deal of misunderstanding about shoulder disorders in our daily lives, and sometimes even orthopedic surgeons who are not trained in shoulder disorders may have the same misconceptions as amateurs. Some patients may delay treatment and may even have limited shoulder function, which can seriously affect their daily life. In fact, rotator cuff injuries are the most prevalent shoulder disorders, followed by acromioclavicular impingement and shoulder instability, while the incidence of true frozen shoulder is relatively rare. Therefore, it is important to understand shoulder disorders correctly. According to statistics, the highest incidence of shoulder joint disease is rotator cuff injury, which accounts for 30-40% of shoulder joint disease. Rotator cuff injury is a very common degenerative disease of the shoulder joint, and its occurrence is positively correlated with age. The symptoms of rotator cuff tear are similar to those of subacromial impingement syndrome, but it is also accompanied by shoulder abduction weakness. Athletes, those who lift heavy objects, and those who suffer from traumatic injuries are prone to rotator cuff injuries. Typical symptoms are pain in the neck and shoulder at night and pain in the upper arm; sometimes they are afraid to sleep on the affected side or even wake up with pain; the shoulder joint may be weak during abduction, supination or posterior extension, which seriously affects the patient’s life. Therefore, patients with mild rotator cuff injuries, such as rotator cuff contusions, can rest, suspend the arm with a triangular towel, and limit the shoulder activity for 2-3 weeks, while local physiotherapy such as ice packs can be applied, and those with severe pain can be treated with oral anti-inflammatory and analgesic drugs. For more serious rotator cuff injuries such as rotator cuff rupture in the acute stage, you should go to a specialist hospital in a timely manner and consider shoulder arthroscopy to repair the rotator cuff after being diagnosed by a specialist. The main symptoms of subacromial impingement are pain around the shoulder, weakness of the affected arm, limited shoulder movement, shoulder joint cannot be lifted normally, a distinct cracking sound can be heard when the shoulder is moved passively, and pain when the elbow is flexed 90° and the shoulder is extended outward and flexed 30° forward when the elbow and shoulder are buckled. In general, impingement and rotator cuff lesions occur more frequently in older individuals and throwing athletes. If not effectively diagnosed and treated, it may lead to rupture of important tendons of the shoulder joint at a later stage, seriously affecting the function and life of the patient. In the early stage of the disease, physical therapy, ice packs and oral painkillers can be applied to the shoulder; in the acute stage, the affected arm can be suspended by a triangular scarf, and local closure can also be performed; if conservative treatment is not effective, surgery can be considered. The third most common shoulder joint disease is shoulder dislocation. The shoulder joint is prone to dislocation or subluxation due to trauma or degeneration of the joint structure, as well as the high mobility and relatively poor stability of the shoulder joint itself. If dislocation is not treated effectively, some patients may suffer from habitual shoulder dislocation, which can seriously affect their daily life. Patients with initial shoulder dislocation should undergo closed repositioning as soon as possible, and after repositioning, a triangular scarf suspension and braking should be performed for 3-4 weeks. If a patient develops into a habitual dislocation, he or she can go to a specialist clinic for X-ray or MRI examination to clarify the specific lesion site and consider shoulder arthroscopic surgery to repair the damaged shoulder joint area. The combined incidence of the first three diseases accounts for almost 70% or more of shoulder joint diseases. In addition to these, many other shoulder joint diseases exist, such as acromioclavicular arthritis, biceps longus tendonitis and calcific supraspinatus tendonitis. This makes periarthritic shoulder disease a much smaller percentage of shoulder joint disease. Frozen shoulder, in essence, is adhesive capsulitis. Thus, when we think that shoulder pain is frozen shoulder, we may unknowingly go into the misunderstanding of shoulder joint diseases. In fact, shoulder joint diseases are complex and diverse, so it is recommended that patients go to a specialist hospital that specializes in shoulder joint diseases to avoid delaying the condition and effectively relieve shoulder pain and a series of other problems.