The common thread in these conditions is a reaction that is disproportionate to any apparent objective cause, or stimulus. A person’s fear, tension, or panic in the face of anticipated or imagined danger is so severe that it interfaces with normal living. Of the nine phobias and disorders in this group, panic disorder with agoraphobia can be considered a prototype. This panic disorder causes a person to sweat, tremble or feel faint or afraid of dying (to name just a few of the possible 13 symptoms) when attempting to leave familiar surroundings. Because of this anxiety a person may find leaving home extremely threatening. Some of the anxiety disorders, like post-traumatic stress can be traced to a specific time or event that terrified the person and continues to haunt him or her.