DefinitionUlnar nerve dysfunction is a problem with the nerve that travels from the wrist to the shoulder, which leads to movement or sensation problems in the wrist and hand.Alternative NamesNeuropathy - ulnar nerve; Ulnar nerve palsyCauses, incidence, and risk factorsUlnar nerve dysfunction is a common form of peripheral neuropathy. It occurs when there is damage to the ulnar nerve, which travels down the arm. The ulnar nerve is near the surface of the body where it crosses the elbow, so long-term pressure on the elbow may cause damage.The damage involves the destruction of the nerve covering (myelin sheath) or part of the nerve (axon). This damage slows or prevents nerve signaling.A problem with one single nerve group (such as the ulnar nerve) is called mononeuropathy. The usual causes