The ulnar nerve, the primary nerve in the arm, starts in the neck, travels under muscles on the inside of your forearm, through your wrist, and into your hand on the side of the palm with the little finger. As the nerve enters the hand, it travels through another tunnel (Guyon’s canal). This nerve provides sensation to the fourth and fifth fingers, and controls most of the little muscles in the hand that help with fine movements, and some of the larger muscles in the forearm that help you form a grip.
Because it runs through areas of the arm and hand that bend, the nerve can become compressed and cause a variety of symptoms throughout the length of the arm. Compression of the ulnar nerve triggers ulnar nerve entrapment. The two most common sites are the wrist and the elbow, but it can also happen between the elbow and the shoulder or the elbow and the wrist.
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Numbness and tingling are common, especially in the ring and pinky fingers, which may feel as though they are going to sleep. This happens more often when the elbow is bent, such as when driving or holding the phone. Some people wake up at night because their fingers are numb. Slight twinges may be felt when the elbow is bent and weakness in the hand may make it difficult to grip or pick up items. Some people may experience intense pain.
