Fobias

A phobia is an irrational and excessive fear of an object or situation. In most cases, the phobia involves a sense of endangerment or a fear of harm.
Types of phobias:
Acrophobia: is an extremefear of heights, acrophobia can cause a person to fear a variety of things related to being far from the ground. Depending on the phobia's severity, an acrophobic person may equally fear being on ahigh floor of a building or simply climbing a ladder. Some symptoms can be feeling a sense of panic when at height. You may instinctively begin to search for something to cling to. You may find thatyou are unable to trust your own sense of balance. Common reactions include descending immediately, crawling on all fours and kneeling or otherwise lowering the body.http://phobias.about.com/od/introductiontophobias/a/acrophobiaprof.htm
Claustrophobia: fear of enclosed spaces. Like any phobia, the severity of claustrophobia can vary widely from person to person. Sufferers may experiencesymptoms in small rooms, crawl spaces, crowds and many other situations. Some symptoms may be feeling panicked when you are in a small space. You may sweat, shake or experience heart palpitations. Youmay cry or yell. You might attempt to get out of the situation by any means possible. Some people with claustrophobia find it difficult to breathe. Some say that it feels like the walls are closingin on them.
http://phobias.about.com/od/introductiontophobias/a/claustroprof.htm
Aerophobia : fear of flying, may be associated with numerous other phobias. Sometimes it appears on its own. Thefear of flying is estimated to affect as many as 25% of people, although a full-blown phobia is significantly less common. Symptoms are shaking, sweating, gastrointestinal distress, and heartpalpitations. You may become flushed, disoriented, and unable to think clearly. People with a fear of flying may feel upset and irritable, and even lash out at friends, relatives, or airline personnel....