The early symptoms of periarthritis of the shoulder are pain in the shoulder and limited movement of the shoulder joint, especially the action of raising the arm, which is clearly restricted. Therefore, for the treatment of this condition, it is encouraged that patients engage in functional exercises early on. If one fears the pain and dares not to move the shoulder joint, it will lead to stiffness of the joint and atrophy of the surrounding muscles. Generally speaking, periarthritis of the shoulder is a self-limiting disease with a typical duration of about one year. If you can raise your shoulder and perform normal activities within a year, then there will be no residual sequelae afterwards. However, if within a year, the shoulder joint becomes stiff and its movement becomes limited, then after a year, the symptoms of shoulder pain will significantly improve, but there will be some loss of range of motion in the joint. Therefore, for all patients with periarthritis of the shoulder, early functional exercise is encouraged to avoid symptoms such as joint effusion, joint stiffness, and muscle atrophy.