This list of surprising and relatable phobias from A-Z includes some of the most common fears many of us can relate to, as well as unique aversions. Phobias come in all shapes and sizes. Because there are an infinite number of objects and situations, the list of specific phobias is quite long. These common phobias involve an intense or extreme fear of the environment, animals, injections and blood, or certain situations. Here's a more in-depth look at each one. The most common phobias What are the most common phobias ? Before starting this article on the 15 most common phobias , we are going to answer the following question ” What is a phobia? ” A phobia is expressed as an excessive, irrational, and uncontrollable fear reaction towards a stimulant.