Carpal tunnel syndrome is a common condition involving numbness, pain, tingling and instability in the wrist, hand and fingers. It occurs when pressure is put on a nerve in the wrist called the median nerve, which controls motor function in the wrist and hand. This pressure, called impingement, is most often caused by bone spurs, rheumatoid arthritis, repetitive use or injury.
Carpal tunnel syndrome can be diagnosed with tests such as an electromyogram or a nerve conduction study. It can often be effectively treated with non-surgical therapies such as wrist splints, anti-inflammatory drugs or corticosteroids. In cases where pain and numbness persist, surgery (usually endoscopic surgery) may be necessary to relieve pressure on the nerve.