Why is my thumb numb?

Carpal tunnel syndrome is often the cause of numbness in thumb accompanied by pain. The condition arises due to the compression of the median nerve at wrist, between the carpal bones and the transverse carpal ligament. This causes the thenar muscles of the thumb to go numb. The numbness does not limit to thumb alone, but also spreads to the first three fingers as well as the majority of the hand. Since, inflammation of the tendon sheaths is the cause behind carpal tunnel syndrome, flexibility exercises of tendons relieves the thumb pain to some extent.

See a doctor for a proper diagnosis and treatment.

I hope this helps you. And good luck.

You most of the time reduce probably the most sensory nerves within the thumb. It must be repaired ASAP such that it would heal. You want a hand physician. Ideally those matters are repaired inside every week or 2. The nerve degenerates after it's reduce and is more difficult to fix as time passes.