In the process of nerve recovery, sensory changes first appear, i.e., numbness, pins and needles sensation or sensation of electric current flow in certain parts, and the sensation gradually increases as the recovery time increases; in the case of finger nerve severance, for example, the recovery process of finger severance at the root of the finger first appears the symptoms of sensory numbness in the whole finger. After rehabilitation training and drug-assisted treatment, the numbness of the fingers is gradually reduced, from the near and middle joints to the end joints and interfingers. The recovery process was long, and the rehabilitation training included physical therapy and medication, which were helpful for nerve recovery.