The nerve injury of the thumb is treated as follows. The intrinsic nerve of the thumb is a sensory nerve, and only sensory impairment of the finger occurs, without motor impairment or deformity. For this kind of single sensory nerve injury, only the outer nerve membrane suture can be done, and the treatment is usually satisfactory. If the injured nerve is too far apart to be sutured directly, autologous nerve grafting should be performed. If a neuroma is found proximal to the nerve, it can be observed for 2-3 months if it is not interrupted, and those who have not recovered should have the neuroma removed and then sutured. If the injury is long and the injury or contamination is serious considering the possibility of infection, a suture may be placed in each of the distal and proximal ends of the nerve as a fixation and marker for nerve repair in the second phase after the injury has healed.