Only a doctor can diagnose if you have cubital tunnel syndrome, which is what happens when there is pressure on the ulnar nerve, which passes behind the elbow. Cubital tunnel syndrome can be caused by constant pressure on the elbow that then squeezes against the nerve. As well, it can be caused by injury to the elbow or repetitive motions. If you feel tingling or pain in your ring (fourth) finger and little finger, and perhaps decreased sensation, it is possible that you are having problems with the ulnar nerve.