I have had both wrists operated on for carpal tunnel syndrome. My symptoms started when I was bike riding at least fifteen miles when it first started. I thought it was due to the cold weather (it was in the 40's). My fingers would go completely numb. The hand surgeon said there is a sheath that runs through the wrist where the nerves are contained. This opening becomes constricted. The operation just opens the sheath up. I haven't had a problem in the past eight years. I, also, had the operation for "trigger finger".