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Claustrophobia is the fear of being enclosed in a small space or room and unable to escape. It can be triggered by many situations or stimuli, including elevators crowded to capacity, windowless rooms, hotel rooms with closed doors and sealed windows, small cars and even tight-necked clothing. It is typically classified as an anxiety disorder, which often results in panic attacks. The onset of claustrophobia has been attributed to many factors, including a reduction in the size of the amygdala, classical conditioning, or a genetic predisposition to fear small spaces.
One study indicates that anywhere from 5–7% of the world population is affected by severe claustrophobia, but only a small percentage of these people receive some kind of treatment for the disorder.
The term claustrophobia comes from Latin claustrum "a shut in place" and Greek φόβος, phóbos, "fear".

Source: Wikipedia