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Ulnar nerve entrapment occurs when the ulnar nerve becomes compressed or irritated. The Ulnar nerve is the nerve that travels under the muscles on the inside of your forearm and into your hand on the side of the palm with the little finger. The nerve is typically becomes compressed closer to the elbow. Causes for the compression or irritation include sleeping on a bent elbow, fluid build-up and direct blows. Non-surgical treatments as well as surgical treatments are used to alleviate pain and pressure.