What can cause numbness and tingling in an otherwise healthy 25 year old?

Carpal Tunnel . Pain, numbness, tingling, weakness and night pain are the most common symptoms of carpal tunnel syndrome. Treatments: rest, night splint, vitamin b6 100mg / day, over the counter anti-inflammatory meds and ergonomic changes to work space. http://www.centraljerseyhand.com/carpal-tunnel-syndrome.htm.
Numb. You need to see a neurologist or pain or neuromuscular specialist.