If you're experiencing tingling or numbness in your pinky and the two fingers next to it, the culprit may be the ulnar nerve. The ulnar nerve is one of the three main nerves in the arm. It runs from the shoulder to the hand and controls movement and sensation in the fingers and wrist. When this nerve becomes compressed or irritated, it can cause pain, numbness, or tingling in the affected areas. Fortunately, there is a simple and effective stretch that can help to relieve this pressure on the ul