Panic disorder involves sudden and repeated attacks of fear that last for several minutes or longer. These are known as panic attacks. Panic attacks are characterized by a fear of disaster or of losing control. Panic attacks can occur at any time, and many people with panic disorder worry about and dread the possibility of having another attack. Symptoms of panic disorder include but are not limited to, sudden and repeated panic attacks of overwhelming anxiety and fear, feelings of being out of control or fear of death or impending doom, racing heartbeat/sweating/chills/nausea/dizziness, and fear and avoidance of places where panic attacks have happened in the past.