Periarthritis is referred to as frozen shoulder, also known as frozen shoulder and frozen shoulder. It is a chronic inflammation of the muscles, tendons and soft tissues such as the bursa and joint capsule, which forms adhesions inside and outside the joint and hinders the movement of the shoulder. The disease mostly occurs in people around 50 years old, so it is also known as “fifty shoulder”. Although most periarthritis can heal on its own, the disease can last from one and a half to three years. The longer the time, the greater the pain, so the only way to minimize the patient’s pain is to treat it aggressively. So, what symptoms should I be aware of when I have “frozen shoulder”? 1. Shoulder pain: At first, the shoulder is in paroxysmal pain, most of them are chronic, later the pain is gradually increased or stabbing pain, and it is persistent. Most patients often complain of waking up with pain in the second half of the night, unable to sleep, especially unable to lie on the affected side, and especially sensitive to climate change. As the disease progresses, the adhesions of the joint capsule and the soft tissues around the shoulder caused by long-term disuse, the muscle strength gradually decreases, and the rostro-humeral ligament is fixed in a shortened internal rotation position, so that the active and passive activities of the shoulder joint in all directions are limited, especially combing, dressing, washing, forking and other movements. In severe cases, the function of the elbow joint may also be affected. When flexing the elbow, the hand cannot touch the ipsilateral shoulder, especially when the arm is extended backwards. 3. Fear of cold: The affected shoulder is afraid of cold and many patients use cotton pads to wrap the shoulder all year round. 4. Pressure pain: Most patients can feel obvious pressure pain points around the shoulder joint, mostly in the long head tendon groove of the biceps. The pressure points are mostly in the subacromial bursa, rostral process and supraspinatus attachment point, especially in the long head tendon groove of the biceps tendon, and in a few cases, there is widespread pressure pain in the soft tissues around the shoulder. 5.Muscle spasm and atrophy: Spasm of deltoid, supraspinatus and other muscles around the shoulder can occur in the early stage, and disuse muscle atrophy can occur in the late stage, with typical symptoms such as shoulder peak protrusion, inconvenience in lifting and unfavorable backbend, etc. At this time, pain symptoms are reduced. 6.X-ray and laboratory examination: most of the regular radiographs are normal in the frontal and lateral position. In the late stage, some patients can see osteoporosis but no bone destruction, but in the “Y” view of the shoulder joint, most of the bones under the shoulder peak are formed, forming type II or III shoulder peak. Laboratory tests were mostly normal.