What nerve linked to thumb numbness?

Thumb numbness is commonly associated with the median nerve, which runs down the arm and into the hand. This nerve is responsible for sensation in the thumb, index finger, middle finger, and part of the ring finger. Compression or irritation of the median nerve, often seen in conditions like carpal tunnel syndrome, can lead to numbness and tingling in the thumb. Other potential causes of thumb numbness may include issues with the radial or ulnar nerves, but the median nerve is the most frequently linked.