Medically reviewed by Theresa Marko, PT, DPT, MS Ulnar nerve entrapment occurs when there is too much pressure on the ulnar nerve. This leads to hand numbness or tingling in the forearm and pinky side ...

Cubital tunnel syndrome (also known as “cell phone” or “smartphone elbow”) is caused by a pinched or inflamed ulnar nerve, which runs under the “funny bone” and controls the ring and pinky fingers.