Over 50 million people in the US are diagnosed with allergies every year, according to the CDC. In fact, allergies are among the primary causes of chronic conditions in the country. Although you can’t really prevent allergies, you can still control allergic reactions if you know the source.
Generally, if the allergen is breathable, symptoms will usually show up in the lungs, nose, and eyes. And if the allergen is eatable, the reaction is likely to occur in the intestines, stomach, and mouth.