Frozen shoulder, known as periarthritis, is a common condition characterized by shoulder joint pain and limited mobility. The disease is more common in women than in men and is more common in manual laborers. If not treated effectively, it may seriously affect the functional activities of the shoulder joint. In the early stage, the pain in the shoulder joint is paroxysmal, often triggered by weather changes and exertion, and then gradually develops into persistent pain, which gradually worsens, with lighter days and heavier nights. When the shoulder is stretched, it can cause severe pain. There may be widespread pressure pain in the shoulder joint that radiates to the neck and elbow, and there may be different degrees of deltoid atrophy. The causes of frozen shoulder: 1. Most of the disease occurs in middle-aged and older people over 40 years old, with degenerative soft tissue lesions and weakened ability to withstand various external forces being the basic factors. 2. Chronic injury caused by long-term over-activity and poor posture is the main stimulating factor. 3.The shoulder has been fixed for too long after the upper limb trauma, and the periapical tissues have secondary atrophy and adhesion. 4.Improper treatment after acute contusion and strain of the shoulder. 5.Extra-shoulder factors: cervical spondylosis, heart, lung and biliary tract diseases triggered by shoulder traction pain, because the original disease does not heal for a long time so that the shoulder muscle persistent spasm, ischemia and the formation of inflammatory lesions, transformed into the real frozen shoulder.