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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 can cause a lot of extremely unusual symptoms. In rare cases, anxiety may cause a feeling of having swollen lymph nodes or swollen glands, and for those with health anxiety, this sensation can be incredibly frightening. Interestingly, it's unclear if anxiety or stress actually causes swollen lymph nodes.