Carpal Tunnel Syndrome (CTS) is a condition where the median nerve is compressed as it passes through a short tunnel at the wrist. This tunnel contains the tendons that bend the fingers and thumb as well as the nerve. CTS commonly affects women in middle age but can occur at any age in men or women. CTS may be associated with swelling in the tunnel which may be caused by inflammation of the tendons, a fracture of the wrist, wrist arthritis and other less common conditions. In most cases, the cause is not identifiable.