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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.
Common signs and symptoms of anxiety include: 1  Nervousness. 2  Feelings of being powerless. 3  Feelings of impeding danger.  Increased heart 1  rate. Hyperventilation (heavy breathing) 2  Sweating. Trembling.  Weakness and 1  fatigue. Lack of concentration and focus other than the cause of  worry.