Xenophobia: The Fear or the extreme dislike of the unknown
People tend to be afraid of the things they don't know about.For Example,the future or the dark.
However, Some People are afraid of or have an extreme dislike for Other people.
During world war 2,After the Japanese bombed Pearl Harbor, There was such an extreme dislike for them, That they were forced into Internment camps by President Franklin D Roosevelt Under Executive order 9066.
Other people fear large bodies of water. This is due to the fact that they can not see the bottom of the body of water, which triggers the Fear of the unknown.
A way to take care of this fear is to consult it with someone,taking medicine ,Or facing the problem head on.
However they choose to overcome this fear,They will eventually.