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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.
1 GAD is quite common, affecting millions of people. 2  While there is no single cause of GAD, there are many factors that increase the risk of developing this disorder. 3  Signs and symptoms of anxiety can include those that are emotional or behavioral and ways of thinking that are responses to feeling as if one is in danger.