User blog comment:Nanepul/irrational fears./@comment-1988716-20141008234724

Generally, when creating Fears, we go by the policy of "We don't base Fears off of fears--" in other words, phobias. But of course, what with this being a mythos anyone can do what they want with, yeah you can.. do what you want with it. Though The Intrusion is arguably the closest we've got to that.

Remember, though, that the one problem with basing a Fear off a phobia is.. well, what is the point? Sure, I find The Intrusion scary, I find bugs terrifying, but all that means is I will stay pretty far away from reading anything featuring that Fear. So if anything, a phobia-based Fear is a good way to shut out potential audiences. Phobias are more of an aversion kinda thing than anything particularly compelling. We're storytellers here, we want to be compelling.

Of course, all of this is really just my own reasoning and not an end-all answer.