Taken to the extreme, it can even kill. Some are totally immobilized by fear. To them, fear becomes a bondage, a prison from which they find no escape. Of course, our society likes to categorize the fears we have. In this case a fear becomes a phobia.
Phobia is in vogue today to describe all sorts of fears which afflict people.
There are literally hundreds, if not thousands of phobias. I like to keep a little list of them just so I can feel more scientific about the things that scare me. But wait, we're not through. As I said, there are literally hundreds, if not thousands more. And the list grows each day.