When the nerves or tendons inside the carpal tunnel swell or become inflamed (carpal tunnel syndrome), pressure on the nerve causes pain, numbness, tingling, or weakness in the fingers and wrist.
The nerve most commonly affected in carpal tunnel syndrome is the median nerve, which provides motor and sensory function to the hand.
Most physicians recommend trying non-surgical treatments (such as: splinting the wrist, using anti-inflammation medications) before recommending surgery.
Review Date 5/9/2015
Updated by: C. Benjamin Ma, MD, Assistant Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.