The ulnar nerve runs down the arm, past the inside of the elbow, and to the hand near your little finger. Near the elbow, it passes through a tight space known as the cubital tunnel. Injuries that cause inflammation of the ulnar nerve in the cubital tunnel can cause entrapment and compression of the nerve. In addition to those experiencing direct injury, other people at risk for this condition include people whose jobs involve bending the elbows a lot, alcoholics, diabetics, and people with arthritis or thyroid disorders.