The essential feature of Panic Disorder is the presence of recurrent, unexpected Panic Attacks followed by at least one month of persistent concern about having another Panic Attack, worry about the possible implications or consequences of the Panic Attacks, or a significant behavioral change related to the attacks. The Panic Attacks are not due to the direct physiological effects of a substance or a general medical condition.

The criteria for Panic Attack:
A discrete period of intense fear or discomfort, in which four or more of the following symptoms developed abruptly and reached a peak within ten minutes:

• Palpitations, pounding heart, or accelerated heart rate
• Sweating
• Trembling or shaking
• Sensations of shortness of breath or smothering
• Feeling of choking
• Chest pain or discomfort
• Nausea or abdominal distress
• Feeling dizzy, unsteady, lightheaded, or faint
• Derealization (feelings of unreality) or depersonalization (being detached from oneself)
• Fear of losing control or going crazy
• Fear of dying
• Parasthesias (numbness or tingling sensations)
• Chills or hot flushes