221. A phobia is a type of anxiety disorder that causes an individual to experience extreme, irrational fear about a situation, living creature, place, or object.Phobias are diagnosable mental disorders.

222. Alexander the Great, Napoleon, Mussolini and Hitler, all suffered from ailurophobia, the fear of cats.

223. Aerophobia, or the fear of flying, affects an estimated 8 million U.S. adults despite the fact that airplane accidents are actually very uncommon. Around 1 out of every 3 people has some level of fear of flying. Some of the common symptoms associated with this phobia include trembling, rapid heartbeat, and feeling disoriented.

224. Acrophobia fear can lead to anxiety attacks and avoidance of high places. People who suffer from this phobia may go to great lengths to avoid high places such as bridges, towers, or tall buildings.

225. Anatidaephobia is the weird fear that somewhere, somehow, a duck is watching you.