Periarthritis of the shoulder generally refers to a sterile inflammatory response due to chronic strain in the tendons, ligaments, and joint capsule around the shoulder joint, commonly seen in middle-aged and elderly women, and is a self-limiting disease. Clinically, it is referred to as frozen shoulder, or fifty shoulder. With the occurrence of periarthritis of the shoulder, there will be pain around the shoulder joint, particularly where the tendons and ligaments attach, with the pain covering a wide area and notably manifesting as resting pain at night. In the early stages of periarthritis, it should be managed with rest and appropriate physical therapies, including infrared therapy, among others, to alleviate inflammation and relieve pain. When necessary, oral non-steroidal anti-inflammatory and pain relief medications may be used to ease the symptoms, along with appropriate functional exercises to prevent shoulder joint stiffness due to prolonged immobility. (Specific medications should be taken under the guidance of a physician.)