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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.
Digestive Problems and the Effects of Anxiety. Anxiety causes a lot of different symptoms. Anxiety causes headaches, it causes muscle pain - it even causes cold feet. But not everyone experiences all of those symptoms, because every individual person's anxiety is different.