Carpal tunnel syndrome occurs when the median nerve is compressed in the carpal tunnel in the wrist. The result is pain, numbness and restricted movement in the hand and fingers. It also interferes with sleep quality. It affects a variety of people, most often those who work with their hands in repetitive motions.

Other risk factors for carpal tunnel syndrome include past fractures and injuries, diabetes and rheumatoid arthritis. The disorder affects millions of people worldwide. If left untreated, muscles can atrophy, and the effects are often irreversible.