Ulnar nerve compression about the elbow is common. If diagnosed and treated early, satisfactory results can be expected. Severe chronic nerve compression may lead to permanent nerve damage. The diagnosis can be made by careful history, physical examination, knowledge of the nerve anatomy, and sometimes electrodiagnosis. Cubital tunnel syndrome must be differentiated from TOS and ulnar tunnel syndrome. Double-crush syndrome should be ruled out. Nonoperative treatment must be attempted first, whereas surgical treatment is indicated in severe and chronic cases. Satisfactory results can be achieved after surgery if nerve damage is absent and careful attention to technical details and gentle handling of the nerve are exercised.