Feelings of dread or worry, often accompanied by physical signs of arousal, which are a normal reaction to stress. Excessive anxiety with no obvious source, however, may point to an anxiety disorder.
Example: A patient anticipating surgery complains of palpitations, shortness of breath, nausea, diarrhea, and sweating spells.
Grinnell, R. (2008). Anxiety. Psych Central. Retrieved on May 4, 2015, from http://psychcentral.com/encyclopedia/2008/anxiety/