Whether or not a nerve injury will cause muscle atrophy depends largely on whether or not the injured nerve is a motor nerve. If the injured nerve is a sensory nerve, the muscle will generally not atrophy and will not cause muscle paralysis. In medicine, nerves are often divided into sensory nerves, motor nerves, and mixed sensory and motor nerves. If the motor nerve and the mixed nerve are damaged, it will cause atrophy of the muscles it innervates, but when the nerve is restored, the muscle atrophy can also be improved. After the nerve injury, it is necessary to consult a doctor in time to understand the extent of the nerve injury, and timely conservative treatment or surgical treatment.