They say that carpal tunnel affects the nervous system. Is damage permanent?

Can be. Carpal tunnel syndrome is a pinched nerve in the wrist that causes numbness and tingling in the fingers. This can lead to permanent nerve damage. The only way to know if there is permanent nerve damage is to take the pressure off the nerve and see how much of the the numbness and tingling improves. Nerve tests (emgs) can help but we'll not give you a definitive answer of permanent nerve damage.
It can be over time . With prolonged and unrelieved pressure permanent nerve and muscle injury can result.

Related Questions

How does carpal tunnel surgery affect the nervous system?

Improves CTS. Cts is caused by compression of the median nerve at the level of the wrist. Carpal tunnel surgery removes the pressure on the median nerve and in most cases improves the pain, numbness, and tingling associated with cts. Read more...
Relieves pressure. The goal of carpal tunnel surgery is to relieve pressure on the median nerve within the carpal tunnel. Thus should relieve pain, numbness, tingling and muscle atrophy due to compromise of the nerve. Read more...