Carpal tunnel syndrome is a progressive condition affecting the hand and wrist. It is caused by a compression of the median nerve that gradually gets worse if left untreated. As the median nerve is squeezed, less blood and nutrients flow through it, causing pain, numbness, and weakness in the fingers and thumb.
(Click Carpal Tunnel Syndrome to read the full eMedTV article, which provides an explanation of the anatomy of the carpal tunnel, as well as a discussion on people who are most at risk for developing the condition.)