Painful arc syndrome is a chronic shoulder pain syndrome caused by repeated friction and impingement between structures in the subacromial space and the rostral shoulder arch during shoulder abduction activities, and is a common condition in people over middle age. The disease includes subacromial bursitis, supraspinatus tendinitis, supraspinatus tendon calcification, rotator cuff rupture, and biceps longus tenosynovitis. The common clinical feature is an arc of pain during active abduction of the shoulder joint, while passive activity is significantly less painful or even completely painless. A variety of shoulder disorders can cause this. For example, supraspinatus rupture, supraspinatus tenosynovitis, supraspinatus calcification, subacromial bursitis, and humerus greater tuberosity fracture can be caused. During treatment, shoulder impingement, such as lifting heavy objects, should be avoided. In the later stage of treatment, active functional exercises should be carried out, especially for those with limited range of motion of the shoulder joint, back and forth, left and right hand shaking, shoulder shaking and shoulder swinging. In particular, for those who have limited range of motion of the shoulder joint, you can practice back and forth, shaking the shoulder, swinging the shoulder, etc. The range and amplitude can be from small to large. The exercises can loosen the adhesions and contractures of the soft tissues of the shoulder and prevent the occurrence of frozen shoulder.