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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.
The following are the most likely causes of PMS anxiety: 1  Cortisol Increase Studies have shown that before a woman's period, a stress hormone known as cortisol tends to increase. 2  In many ways, anxiety is a form of long term stress, and stress is known to make anxiety symptoms worse.