<unk>  is classified as a mental and behavioral disorder, specifically an anxiety disorder. Symptoms generally develop during childhood or adolescence.<unk>  is typically thought to have one key symptom: fear of suffocation. In at least one, if not several, of the following areas: small rooms, MRI or CAT scan apparatus, cars, buses, airplanes, trains, tunnels, underwater caves, cellars, elevators and caves. Being enclosed or thinking about being enclosed in a confined space can trigger fears of not being able to breathe properly, and running out of oxygen. It is not always the small space that triggers these emotions, but it's more the fear of the possibilities of what could happen while confined to that area. When anxiety levels start to reach a certain ppo level, the person may start to experience: * sweating and/or chills * accelerated heart rate and a rise in blood pressure * dizziness, fainting spells, lightheadedness and frozen in fear * dry mouth * hyperventilation * hot flashes * shaking or trembling and a sense of "butterflies" in the stomach * nausea * headache * numbness * a choking sensation * tightness in the chest/chest pain and difficulty breathing * an urge to use the bathroom * confusion or disorientation * fear of harm or illness
Claustrophobia
Phobia
Hyperreligiosity
Body integrity dysphoria
Alexithymia
Emotional lability
Automatism 
Automatic behavior