claustrophobia

again from wikipedia:

Basic symptoms of claustrophobia

Claustrophobia is typically thought to have two key symptoms: fear of restriction and fear of suffocation. A typical claustrophobic will fear restriction in at least one, if not several, of the following areas: small rooms, locked rooms, tunnels, cellars, elevators, subway trains, caves, and crowded areas. Additionally, the fear of restriction can cause some claustrophobics to fear trivial matters such as sitting in a barber’s chair or waiting in line at a grocery store simply out of a fear of confinement to a single space. However, claustrophobics are not necessarily afraid of these areas themselves, but, rather, they fear what could happen to them should they become confined to said area. Often, when confined to an area, claustrophobics begin to fear suffocation, believing that there may be a lack of air in the area to which they are confined. Any combination of the above symptoms can lead to severe panic attacks. However, most claustrophobics do everything in their power to avoid these situations.[2]