Claustrophobia:

Claustrophobia is of the negative traits.
It has a value of -4

The description is as follows:

Claustrophobia:
Maybe you spent all your time since birth running around with caravans and never really lived in a house or maybe your greatest fear has always been to buried alive: in closed rooms or cramped confines you don't just feel funny, you have full blown panic attacks.
If the space around you is too small, all tests on perception and intelligence as well as on any skill that (according to the master) requires concentration is heavily penalized.
Please make out the details with the master.