The carpal tunnel is a space in your wrist surrounded by a band of fibrous tissue that normally functions as a support for the joint. The median nerve passes through the carpal tunnel to receive sensations from the thumb, index, and middle fingers of your hand. Any condition that causes swelling or inflammation within the carpal tunnel can squeeze and irritate the median nerve. Swelling around the median nerve causes tingling and numbness of the thumb, index, and the middle fingers. Over 85 percentage of my patients with carpal tunnel syndrome experience relief of symptoms without the need for surgery.