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Prior fracture or dislocation of the elbow.Some factors put you more at risk for developing cubital tunnel syndrome. This is commonly called "hitting your funny bone." A direct blow to the inside of the elbow can cause pain, electric shock sensation, and numbness in the little and ring fingers.

Fluid buildup in the elbow can cause swelling that may compress the nerve.Leaning on your elbow for long periods of time can put pressure on the nerve.Over time, this sliding back and forth may irritate the nerve. In some people, the nerve slides out from behind the medial epicondyle when the elbow is bent.For example, many people sleep with their elbows bent, which can aggravate symptoms of ulnar nerve compression and cause you to wake up at night with your fingers asleep. Because this stretching can irritate the nerve, keeping your elbow bent for long periods or repeatedly bending your elbow can cause painful symptoms.

When your bend your elbow, the ulnar nerve must stretch around the boney ridge of the medial epicondyle.

There are several things that can cause pressure on the nerve at the elbow: The ulnar nerve is especially vulnerable to compression at the elbow because it must travel through a narrow space with very little soft tissue to protect it. In many cases of cubital tunnel syndrome, the exact cause is not known.