The only thing you have to fear is fear itself … in which case you are suffering from phobophobia, the fear of fear. Okay, phobophobia is probably not what Franklin D. Roosevelt was referring to in his famous speech but how odd is a phobia of fear? And what you might find even more peculiar is the science behind fear. Neurologists and psychologists are studying fear to determine how phobias and anxiety disorders form, how to treat them, and even how to predict them.