In medical terms, CTS stands for Carpal Tunnel Syndrome. Carpal Tunnel Syndrome is a common neurological disorder that occurs when the median nerve, which runs from the forearm into the palm of the hand, becomes pressed or squeezed at the wrist. This compression of the median nerve can lead to symptoms such as numbness, tingling, weakness, and pain in the hand and wrist, and can affect the thumb, index, and middle fingers.