Anxiety is an ubiquitous human emotion. Its expression can range from a normal reaction to an acutely threatening stimulus to an anxiety attack with multiple physical sensations and fear of impending doom in response to an unknown stimulus. There are two properties that underlie the definitions of anxiety. It is generally unpleasant and future-oriented. It is distinguished from fear in that it either has no discernible source of danger or the emotion is disproportionate to the fear stimulus. Lader (1972) defines pathologic anxiety by subjective assessment of the individual patient that the symptoms are more frequent, more severe, or more persistent than those to which he or she is accustomed to or is able to tolerate.
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