Peripheral nerve damage may recover on its own, whether it can recover on its own depends mainly on the degree of nerve damage. Peripheral nerve damage can be categorized into I~V degree according to the five degree classification method, among which I~III degree can be recovered well, IV degree can only be partially recovered, and V degree is difficult to be recovered. Degree I: only the nerve conduction function is lost, the nerve axon is still intact or partially demyelinated. Degree II: the nerve axon is interrupted and Wallerian degeneration occurs at the distal end of the injury. However, the nerve endotube is still intact, and the regenerated axon growing from the proximal end can grow along the original nerve channel to the end organ, and the recovery of nerve function is relatively complete. Degree III: Disruption of nerve fibers within the nerve bundle, but the bundle membrane still maintains continuity. There is usually little bleeding and less scar formation. Degeneration of nerve fibers distal to the injury occurs. Regenerating axons growing from the proximal end can grow along the fascicle membrane to the distal end, find growth channels after degeneration, grow into them and reach the end organs, with better functional recovery. Degree IV: Part of the nerve bundle is interrupted, the nerve tunica is still intact, and small hematomas can be formed by bleeding within the tunica, and intertunica scar can be formed in the future. The interrupted distal nerve fibers are degenerated, and the axon that grows from the proximal end cannot grow into the distal growth channel due to the intertrabecular scar, making it difficult to restore its function. Only the uninjured nerve bundle can regain partial function. Degree V: The nerve is completely severed, with hemorrhage and edema at the severed end, and scarring is formed later. Degeneration occurs on the distal side of the nerve, and it is difficult for the axon growing from the proximal end to pass through the scar between the severed ends, and nerve function cannot be restored. When peripheral nerve damage occurs, it is important to seek prompt medical attention and treat accordingly under the guidance of a physician to avoid severe symptoms.