Rotator cuff injury clinically usually shows shoulder abduction, shoulder pain when lifting up, activity limitation, etc. It is mainly judged by MRI, and at the same time, the patient’s manifestation symptoms can also be used as reference. 1. MRI examination: the location and severity of rotator cuff injury can be observed through MRI examination. If slight bleeding and edema are found in the shoulder, the condition is mild; if there is thinning or atrophy of the tendon, rotator cuff tear, etc., the condition is more serious. 2. Symptoms: if the patient has slight pain, the pain can be alleviated after resting, it is a mild condition; if the pain seriously affects the normal life, muscle weakness, atrophy and other symptoms, it is a more serious situation. If rotator cuff injury occurs, it is recommended to seek medical treatment as soon as possible, and follow the doctor’s instructions for standardized treatment, in order to reduce the adverse effects of the disease.