Do you know the word "claustrophobia"? If not, congratulations! Let me explain why. Claustrophobia is an anxiety disorder and the fear of being in closed or small spaces for having no escape. Like many other disorders, those affected will sooner or later be forced to learn about their conditions. In that sense, you should feel lucky for not having to know this word. That being said, since we are hanging out in this forum to improve our English, let's add it to our vocabularly to be in the know. What do you think?