What is Carpal Tunnel Syndrome?
Carpal tunnel syndrome is a condition that may occur when the median nerve, a major provider of sensation to your hand and fingers, becomes compressed within the carpal tunnel. The carpal tunnel is formed by the eight wrist (carpal) bones and the transverse carpal ligament. The tunnel acts as a passageway at your wrist through which the median nerve and nine tendons pass to reach your hand. Compression of the median nerve, which occurs due to a decrease in the space inside the tunnel, may be caused by conditions such as swelling of the tissue lining the tunnel, fluid retention, presence of a ganglion cyst, an abnormal muscle structure or other conditions. In many instances, the cause is unknown.