A specific phobia is an extreme and pre-posteriors fear of something that is not actual danger. Some of most common specific phobias that can a person suffer are heights, driving of highway, water, dogs, flying, mines, and escalators. These things are not such fear. But the people who face the specific phobia from any one thing or more are irrational fear of a specific thing. These types of phobias are appearing in childhood and remain into adulthood. Main causes of those specific phobias are not well understood, but same evidence that these types of phobias are develop from families.