Panic attacks:
Discrete periods of sudden onset of intense apprehension, fearfulness, or terror, often associated with feelings of impending doom. During these attacks there are symptoms such as shortness of breath or smothering sensations; palpitations, pounding heart, or accelerated heart rate; chest pain or discomfort; choking; and fear of going crazy or losing control. Panic attacks may be unexpected (uncued), in which the onset of the attack is not associated with a situational trigger and instead occurs "out of the blue"; situationally bound, in which the panic attack almost invariably occurs immediately on exposure to, or in anticipation of, a situational trigger ("cue"); and situationally predisposed, in which the panic attack is more likely to occur on exposure to a situational trigger but is not invariably associated with it.
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