Numbness of ulnar nerve after rotator cuff injury is usually related to blood transportation obstacle, inflammatory edema, nerve not recovered and other factors, which can be treated conservatively or surgically according to the cause. 1. Blood transportation obstacle: if the nerve numbness is caused by poor blood circulation after surgery, hot compresses and massage can be used to accelerate blood circulation. 2. Inflammatory edema: In the postoperative inflammatory edema period, local tissue congestion will cause nerve compression. It can lead to numbness, can follow the medical advice to take glucocorticoid drugs, such as dexamethasone, methylprednisolone and so on. 3. Nerve pull is not recovered: the nerve pull stimulation caused by the surgery, there will be numbness, usually can be gradually recovered on its own, can also be taken orally nutritive nerve medication, such as ghrelin, methylcobalamin and so on. Numbness of the nerve after rotator cuff injury surgery, it is recommended to consult a doctor in time, analyze the cause and then target treatment. Specific medication, should be under the guidance of physicians, to avoid unauthorized use.