Frozen shoulder is also known as periarthritis of the shoulder joint, also known as frozen shoulder and frozen shoulder. Since it often occurs in middle-aged and older patients, it is sometimes referred to as fifty shoulder. It is a chronic and specific inflammation of the shoulder joint capsule and its surrounding soft tissues such as ligaments, tendons and bursae. It should be reminded that with the improvement and development of disease recognition, diagnosis, and imaging techniques, many clinical diagnoses of so-called frozen shoulder have been made with a clear disease diagnosis. Many patients develop periarthritis as a result of untimely diagnosis of early shoulder problems. The main manifestation is pain arising from the shoulder and gradually worsening, especially at night, especially after more housework or inappropriate exercise, and the shoulder joint movement function will be further restricted. The main clinical manifestations are: 1. Shoulder pain: It is the main symptom, which may appear in a specific posture or activity in the early stage. Later symptoms are persistent and interfere with sleep, accompanied by muscle spasm. The pain may gradually increase or cut like pain (when in a particular position), and the pain is often aggravated by climate change, after exertion or by accidental impact. The pain and muscle spasm is not only limited to the shoulder, but also radiates to the upper arm, shoulder and elbow, and forearm. 2. Restriction of shoulder joint movement: The shoulder joint movement is restricted in all directions. As the disease progresses, it is difficult to complete such movements as combing hair, dressing, washing face, forking the waist, etc. Especially in severe cases, the function of the elbow joint may also be affected. In the advanced stage, shoulder joint movement is rarely or even completely lost. The main reason is due to extensive inflammatory adhesions in the soft tissues around the shoulder joint. After a long period of time, the muscles around the shoulder joint may also become atrophied. 3. Fear of cold: The affected shoulder likes warmth, fears cold and wind, and even in the hot summer the shoulder is afraid to blow, mainly due to soft tissue damage around the shoulder joint. However, it is not recommended to apply local heat or other heat therapy such as baking when the pain is obvious in the acute stage, which may lead to aggravation of the pain. 4. Pressure pain: Most patients in the early stage can touch obvious pressure pain points around the shoulder joint. In contrast, local pressure pain points are not clear in patients with mid- to late-stage frozen shoulder. Therefore, it is important to pay attention to the fact that the diagnosis of frozen shoulder is too general. Due to the difference in possible causes and corresponding treatment, after the appearance of shoulder joint symptoms, if they cannot be relieved after rest for a short period of time, you should promptly consult a hospital for a clear diagnosis, and avoid blind exercise leading to aggravation of the injury and gradual development of the frozen shoulder state leading to treatment difficulties.