Panic disorder is the nervous systems flashing danger signals at inappropriate times.
Without any provocation, they feel the same emotional and physical sensations they would if their lives were in jeopardy. The attacks seem to come out of thin air, in places where there is nothing to fear. People with agoraphobia are afraid of being in public places from which they think escape would be difficult. But, as anyone that suffers from it knows, there's much more to anxiety than mere words. It can have potentially crippling effects and even take control of your life if left untreated.