Damage to the ulnar nerve causing numbness in the little finger is mainly seen in the ulnar nerve compression, rupture, chronic injury and other conditions, need to consult a doctor in a timely manner under the guidance of a specialist. If the ulnar nerve is compressed, diuresis and other measures are needed to release the compression; if the ulnar nerve is severed, surgical anastomosis of the severed end is needed as soon as possible. 1. If the ulnar nerve is only pinched, resulting in ulnar nerve contusion, edema, and the nerve is not severed, the patient’s nerve function is expected to recover after a period of time with the use of dehydrating drugs, hormonal drugs and neurotrophic drugs in the acute stage of treatment. 2. If the ulnar nerve has been severed, the severed ulnar nerve end should be anastomosed as soon as possible. If the nerve bundle can be anastomosed with the sensory nerve and the motor nerve separately, the patient can recover faster. 3. If the ulnar nerve is chronically damaged, the treatment focuses on the rehabilitation and reconstruction of the hand deformity, restoring the patient’s nerve function to a near-normal state as far as possible, in order to minimize the impact on the patient’s daily work and life. Damage to the ulnar nerve should be repaired immediately under the guidance of a specialist. After treatment, patients can undergo rehabilitation training under the guidance of physicians from professional rehabilitation centers or rehabilitation departments, which can help to alleviate the numbness of the little finger and restore the function as much as possible.