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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.
Symptoms of anxiety disorders. Anxiety disorders are a form of mental illness that causes people to experience distressing and frequent bouts of fear and apprehension. Many will experience these feelings when periodically doing things like public speaking or a job interview.