What exactly is carpal tunnel ?

Question

i know it happens on like, your arm, but what is it?

Answer 1

A painful and disabling disorder caused by inflammation in the tendons that run through the narrow carpal tunnel in the wrist.

Answer 2

Your wrist bones are called your carpals.

The carpal tunnel is a tunnel through them that some tendons or nerves go through.

Carpal tunnel syndrome is when that gets inflamed and hurts really bad.  It's often caused by repetitive activities, such as typing all day every day (like if you are an admin assistant or something).