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Symptoms of Anxiety. Symptoms of Anxiety: Introduction. The symptoms of anxiety are due to the body's reaction to stress called the fright, fight or flight response. This reaction developed in early human evolution as a means to increase alertness and readiness to react to dangerous stressors, such as the threat of a man-eating predator.
The physiological symptoms of anxiety may include: Neurological, as headache, paresthesias, vertigo, or presyncope. Digestive, as abdominal pain, nausea, diarrhea, indigestion, dry mouth, or bolus. Respiratory, as shortness of breath or sighing breathing. Cardiac, as palpitations, tachycardia, or chest pain.