Many self-diagnose this condition because of its common signs, weakness of the wrist and numbness and tingling in the fingers. The name ‘Carpal Tunnel’ comes from the small space in the arm that runs tendons from the forearm to the wrist. Inside this space is the meridian nerve, the cause of the symptoms you experience with Carpal Tunnel. The weakness, numbness and tingling is caused by pressure on this nerve. The pressure is often caused by swelling which can be easily reduced on your own!