What are some of the mechanisms of fear or phobia?

Claustrophobia: fear of enclosed spaces. Sometimes the fear of flying is actually more closely linked to a fear of enclosed spaces. People with this fear say they feel like the walls are closing on them. Some theories suggest there is a genetic link to specific phobias as a kind of dormant survival mechanism. read more

Situational phobias (fears triggered by a specific situation) including the fear of enclosed spaces (claustrophobia), flying, driving, tunnels, and bridges. Blood-Injection-Injury phobia, the fear of blood, injury, illness, needles, or other medical procedures. Some phobias, however, don’t fall into one of the four common categories. read more

A specific phobia is a marked and persistent fear of an object or situation which brings about an excessive or unreasonable fear when in the presence of, or anticipating, a specific object; the specific phobias may also include concerns with losing control, panicking, and fainting which is the direct result of an encounter with the phobia. read more