Panic is the most extreme form of anxiety. A person experiencing panic may feel terror, confusion, or behave irrationally, often as a result of a perceived threat, for example, a natural disaster or the possibility of a plane crashing. Panic can sometimes result in panic attacks, and panic disorder is a condition characterized by the fear of experiencing a panic attack, especially in a public place. Those who experience frequent panic attacks or fear the onset of an attack may wish to speak to a therapist.