Radial nerve compression in the forearm or wrist The weakness occurs when attempting to separate the fingers, when trying to bend the ring and small fingertips, and when trying to bend the wrist. Severe cases can have hand and grip weakness. There can also be pain at the inside portion of the elbow. This condition typically has the same symptoms as Guyon Syndrome but also numbness on the back of the hand on the pinky side. Ulnar nerve compression at the elbow ( Cubital Tunnel Syndrome) The ability to bend the ring and small fingertips remains. The weakness is most noticeable when attempting to separate the fingers. The back side of the hand is usually normal. This causes numbness and tingling typically on the pinky finger side of the hand. Ulnar nerve compression at the wrist (Guyon Syndrome) Soft tissue masses or ganglion cysts can result in nerve compression. An abnormally located muscle can also cause pressure. Sometimes a thickened edge of fascia or tendon can compress a nerve. Fascia is a structure below the fat layer that covers muscles and tendons. Sometimes tendon lining thickens in an enclosed space, and nerve pressure rises. A displaced or angled fracture can stretch the nerve. It can occur after an injury due to bleeding or swelling. In addition to numbness, compression neuropathy can cause weak or twitchy muscles. Compression neuropathy is pressure on a nerve anywhere along its course (Figure 1).
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