Definition:

A panic attack is a sudden episode of intense fear that develops for no apparent reason and that triggers severe physical reactions. Panic attacks can be very frightening. When panic attacks occur, you might think you’re losing control, having a heart attack or even dying.
You may have only one or two panic attacks in your lifetime. But if you have had several panic attacks and have spent long periods in constant fear of another attack, you may have a chronic condition called panic disorder.

Panic attacks were once dismissed as nerves or stress, but they’re now recognized as a real medical condition. Although panic attacks can significantly affect your quality of life, treatment is very effective.

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