The numbness of the back of the hand after a concussion is considered to be an injury to the nerves. If the head trauma is more serious, it is possible to injure the cerebral nerves, cervical spine nerves and so on, so in the recovery period, the patient may suddenly feel discomfort in the arm, with obvious numbness, soreness and other symptoms. Numbness of the arm after concussion can be treated with nutritive nerve medication, such as methylcobalamin tablets, etc. When the nerve function returns to normal, the numbness of the arm can be relieved. The back of the hand can be appropriate hot compresses, massage, the purpose is to accelerate blood circulation, reduce numbness. After head trauma, we should consult the doctor in time, if the diagnosis is concussion, for the numbness of the back of the hand can be observed for a period of time according to the doctor’s advice, and the mild cases can recover on their own within a short period of time; if the persistence or aggravation, we need to consult the doctor again, and under the guidance of the physician, review intracranial magnetic resonance, cervical spine magnetic resonance and other reasons, and then symptomatic treatment.