What is a long words phobia and how does it affect a person?

Different people have different phobias and all are equally disturbing to the people. Some people in the world have the long words phobia. 

Let me tell you with an example, the Hippopotomonstrosesquippedaliophobia is the largest word in the world and dictionary, which can create some kind of fear in a few people. They might feel a different type of sensation inside their body. They might behave strangely.