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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.
Anxiety disorder may cause loss of appetite and lack of interest in sex. Other symptoms include muscle tension, headaches, and insomnia. Frequent panic attacks can cause you to fear the anxiety attacks themselves, thereby increasing overall anxiety. The constant state of stress can lead to clinical depression.