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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.
Physical symptoms of anxiety include shortness of breath, muscle tension, a fast heartbeat and dizziness. Anxiety manifestations also include nausea, irritability, trouble sleeping, difficulty concentrating, trouble breathing and trembling. Anxiety occurs when the chemicals located in your brain (neurotransmitters) are decreased.