Whether a nerve injury can recover on its own depends mainly on the degree of nerve injury. Nerve injury is generally divided into three degrees, including: 1, degree I injury: is the nerve was hit or pressure, resulting in temporary loss of nerve, this type of nerve injury can be recovered; 2, degree II injury: refers to the nerve axon interruption, for axon interruption, because the continuity of the nerve is intact, there is also the possibility of self-recovery. Recovery time is 2 weeks, 1 month, some need to take longer, the length of recovery time is mainly related to the degree of injury; 3, Ⅲ degree injury, is a nerve rupture, nerve rupture is mainly sharp injuries or open fractures resulting in nerve avulsion rupture. Because the nerve is interrupted, it cannot recover on its own.