Rotator cuff injury refers to the injury of the tendons around the shoulder joint that occurs during exercise, and the early symptoms mainly include pain, lifting weakness and dysfunction. 1. After rotator cuff injury, the tissues around the shoulder joint wear out and continuous stimulation triggers inflammation, producing pain. 2. The rotator cuff joint is mainly composed of muscles, and when the contraction function of the muscles is impaired, it will affect the normal function of the rotator cuff joint, resulting in lifting weakness of the rotator cuff joint. 3. Shoulder joint mobility is limited, dysfunction, abduction, lifting, back extension, internal rotation and other activities in multiple directions are limited. Daily attention should be paid to protect the rotator cuff joint, avoid rotator cuff joint injury, pay attention to keep warm, avoid catching cold, exercise appropriately and pay attention to balanced nutrition.