Panic Attack

惊恐发作是强烈的恐惧，可能包括心悸突然周期。

Panic attacks are sudden periods of intense fear that may include palpitations, sweating, shaking, shortness of breath, numbness, or a feeling that something bad is going to happen. The maximum degree of symptoms occurs within minutes. Typically they last for about 30 minutes but the duration can vary from seconds to hours. There may be a fear of losing control or chest pain. Panic attacks themselves are not dangerous physically. Panic attacks can occur due to number of disorders including panic disorder, social anxiety disorder, post traumatic stress disorder, drug use disorder, depression, and medical problems. They can either be triggered or occur unexpectedly. Risk factors include smoking and psychological stress. Diagnosis should involve ruling out other conditions that can produce similar symptoms including hyperthyroidism, hyperparathyroidism, heart disease, lung disease, and drug use.