Shoulder pain is a major symptom of a relatively common type of disease. When it comes to shoulder pain, many patients may immediately think of “frozen shoulder”, and in the past, patients with shoulder pain were often labeled as “frozen shoulder”. However, with the increasing research on the shoulder joint, this concept seems too general and increasingly out of date. Nowadays, the term “frozen shoulder” is more commonly used to refer to the relatively narrow concept of “frozen shoulder”. Q: Why is the difference in the name of the disease important? A: It is important to clarify the concept of “frozen shoulder”. Many orthopedic surgeons do not have a good grasp of the disease, and as a result, the treatment may not be appropriate and the condition may get worse. Therefore, when available, patients should see an orthopedic surgeon who has expertise in the field of shoulder joint. Q: What are the diseases that cause shoulder pain? A: Most of the shoulder pain is caused by diseases of the shoulder itself, which is what our orthopedic surgeons are concerned about; while a small number of them are caused by involvement pain from other parts or organs, for example, cholecystitis can cause right shoulder pain, atypical myocardial infarction can cause left shoulder pain, and supragluteal lung cancer (a type of lung cancer), etc. Q: What are the shoulder pain diseases? A: There are many shoulder pain disorders, and they are quite complicated. First of all, according to the age of prevalence, the diseases that cause shoulder pain can be divided into: Before 20 years old: more often caused by trauma or congenital factors, such as fracture or dislocation around the shoulder joint, separated epiphysis, etc. Between 20-40 years old: habitual shoulder dislocation, rotator cuff injury. Over 40 years old: frozen shoulder, rotator cuff calcification, tendinitis of the long head of the biceps tendon, rheumatoid arthritis of the shoulder joint, fracture of the surgical neck of the humerus. The disorders that occur according to gender can be divided into: male: traumatic shoulder dislocation, habitual shoulder dislocation, acromioclavicular dislocation, rotator cuff injury, long head biceps tendon rupture, scapular murmur. In women: rheumatoid osteoarthritis, calcific rotator cuff, proximal humerus fracture, loose shoulder, thoracic outlet syndrome. According to the degree and type of pain, it is divided into: radicular pain: calcific rotator cuff, neuropathic atrophy, septic shoulder arthritis, acromioclavicular dislocation, proximal humerus fracture. Nocturnal pain: frozen shoulder, rotator cuff injury. Spontaneous pain: septic shoulder arthritis, high degree of contracture, calcific rotator cuff injury. Sports pain: frozen shoulder, rotator cuff injury, shoulder-hand syndrome. Neuralgic-like pain: neuralgic amyotrophy, osteochondrosis.