Claustrophobia is the fear of having no escape from small, enclosed spaces. It is an anxiety disorder that is caused by unpleasant or traumatic experiences involving being closed in, such as being locked in a room as a child or living in cramped housing. Symptoms range from mild anxiety and an urge to escape to severe panic attacks with accelerated heart rate, difficulty breathing, sweating, and fainting. Treatment options include counseling, medication, and relaxation techniques.