The body's fear response includes an upsurge of adrenaline and cortisone. Long-time exposure to these chemicals and other related hormones can take a toll on the immune system, making it weaker and less able to fight off infections, viruses, or other illnesses. While fear does not directly cause you to get sick (in most cases), prolonged fear does not put the body in the best position to defend itself from the germs that would like to invade it.

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