Specific psychological phenomenon characterized by sudden onset of anxiety (often unrelated to objective events), accompanied by autonomic symptoms such as tachycardia, paresthesia, flushing, and sweating.

Panic disorder is a mental and behavioral disorder, specifically an anxiety disorder characterized by reoccurring unexpected panic attacks. Panic attacks are sudden periods of intense fear that may include palpitations, sweating, shaking, shortness of breath, numbness, or a feeling that something terrible is going to happen...