People with panic disorder have frequent and unexpected panic attacks. These attacks are characterized by a sudden wave of fear or discomfort or a sense of losing control even when there is no clear danger or trigger. Not everyone who experiences a panic attack will develop panic disorder.

Panic attacks often include physical symptoms that might feel like a heart attack, such as trembling, tingling, or rapid heart rate. Panic attacks can occur at any time. Many people with panic disorder worry about the possibility of having another attack and may significantly change their life to avoid having another attack. Panic attacks can occur as frequently as several times a day or as rarely as a few times a year.  Panic disorder often begins in the late teens or early adulthood. Women are more likely than men to develop panic disorder.