



The carpal tunnel is a passageway in the wrist formed by the carpal ligament and the bones of
the hand. This passageway protects the hand’s main nerve (called the median nerve). Branches of the median nerve travel to the thumb, index, middle and ring fingers. Along with the median nerve, the carpal tunnel also houses the tendons that control the bending of the fingers.

Compressed Nerve

Carpal tunnel syndrome occurs when the median nerve is compressed within the carpal tunnel. This compression can be caused by any of the structures that surround the nerve, including bones and soft tissues. In many cases, no single cause can be identified.

Risk Factors

A variety of factors can increase a person’s risk for carpal tunnel syndrome. It is believed to be more common in people who have smaller carpal tunnels. It is more common in women than in men. The condition may be caused by a fracture or dislocation of the wrist. It may be linked to conditions such as diabetes or rheumatoid arthritis. It can also be triggered by conditions that cause the body to retain fluid, including pregnancy. Repetitive motions of the hand and fingers, especially extensive keyboard use, are often discussed as a possible cause. However, evidence for such a link is conflicting.