Allergies are the body’s way of protecting us from foreign invasion. In fact, allergic reactions are triggered by a harmful substance that gets into our system. Just like your body sends antibodies to attack viruses or bacteria that invade your body’s systems, it will also send antibodies to attack the invasive substance. Since our bodies are all different and are triggered by an assortment of things within our environments — foods, medications, fauna and air pollutants — these antibodies trigger a chemical called histamine to bring on allergic symptoms like sneezing, a stuffy nose or some itchy inflammation.