Periarthritis of the shoulder is caused by chronic strain on the shoulder, leading to aseptic inflammation of the muscles, ligaments, and even the joint capsule surrounding the shoulder joint. Symptoms include localized pain and limited mobility, often seen in middle-aged and elderly women. Once periarthritis of the shoulder occurs, it is important to determine the cause. During treatment, it is important to rest and engage in appropriate functional exercises. Because if rest periods are overly prolonged during the treatment of periarthritis of the shoulder, it can lead to limited range of motion in the shoulder joint. Therefore, appropriate functional exercises should also be performed during the rest and physical therapy process.