claus·tro·pho·bi·a -- n. 

1.  The fear of closed space.

Claustrophobia

From Active Mind-Body Health

Claustrophobia is usually described as a fear of enclosed places. A more accurate description might be 'a fear of not having an easy escape route' because for anyone who experiences this phobia this is the predominating feature - you feel a need to be able to get out or get home, quickly.

This is not an illness; it can be eradicated... (Read More)