How can a person tell if they're claustrophobic?

Claustrophobia: The person would become very anxious in closed, tight spaces -- perhaps like elevators, subways, rooms with no windows, and sometimes airplane seats. Being able to escape easily is key for these people. They may have panic attacks in such situations. About 6% of people worldwide suffer this condition, but most are not being treated. They simply avoid situations that stimulate the fear.