Out-of-the-blue panic attacks aren't without warning -- body sends signals for hour before

Seemingly out of the blue panic attacks may have warning signs 60 minutes before the occurrence, a 2011 study suggests. Physiological instability was found in the hour prior to the episode, but very little physiological change was found at the actual time of the attack.


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http://www.eurekalert.org/pub_releases/2011-07/smu-opa072711.php