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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.
It's well known that anxiety can cause heart palpitations, and it's believed that the main cause may be an over-awareness of one's own heart, combined with surges of adrenaline that may occur at random in those with anxiety. These types of palpitations often trigger panic attacks.