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Mild carpal tunnel symptoms most often affect the hand and sometimes the forearm, but they can spread up to the shoulder. Symptoms include: Numbness or pain in your hand, forearm, or wrist that awakens you at night. (Shaking or moving your fingers may ease this numbness and pain.)
The nerve also controls the muscles around the base of the thumb. The flexor tendons that bend the fingers and thumb also travel through the carpal tunnel. Cause of Carpal Tunnel. Carpal tunnel syndrome occurs when the tissues surrounding the flexor tendons in the wrist swell and put pressure on the median nerve.