Periarthritis of the shoulder, also known as frozen shoulder or "fifty-year-old's shoulder", as the name suggests, most commonly occurs around the age of 50 and is more frequent in women than in men. Periarthritis of the shoulder is merely one clinical manifestation of certain conditions and represents a vague diagnosis. Current clinical research suggests that a significant portion of periarthritis is caused by rotator cuff injuries. The main risk of periarthritis of the shoulder is that it can cause pain in the shoulder and impair the joint's mobility. In cases where significant rotator cuff injuries are ruled out, conservative treatment is primarily adopted for periarthritis of the shoulder. This includes oral anti-inflammatory pain relief medications, local blockade treatments, and enhanced functional exercises for the shoulder joint.