Fall arm rotator cuff edema 21 days or can not lift may be due to soft tissue adhesion, painful irritation or even rotator cuff injury. 1. Tissue adhesion, pain stimulation: after the fall will lead to rotator cuff contusion, edema, the damage is relatively mild patients, the general choice of braking, triangular towel suspension. Prolonged inactivity will lead to soft tissue adhesion around the rotator cuff and muscle stiffness, affecting the shoulder joint lifting; at the same time, when lifting, it is easy to cause pulling stimulation to the damaged area, pain, which may also cause the shoulder joint can not be lifted. 2. Rotator cuff injury: If the injury is relatively serious, the rotator cuff may not only have edema, but may also directly lead to rotator cuff injury, that is, rupture of the rotator cuff tendon. The most common site of total rupture is supraspinatus tendon. Tendon rupture will destabilize the humeral head, damage the glenohumeral joint and the acromioclavicular bursa, and the inability to lift the arm will also occur; in some patients with partial rupture, the abduction of the shoulder joint will have the typical arc of pain. The symptoms of inability to raise the arm alone sometimes cannot accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of a doctor.