There are many types of allergies, including seasonal, food, drug, pet, mold, insect, and latex allergies. An allergy is an overactive immune response to a substance called an allergen that is usually ...

The distinctive whistling sound that accompanies some allergic reactions represents more than a minor inconvenience for millions of Americans. This sound, known as allergic wheezing, serves as an ...

What Is a Peanut Allergy? You have a peanut allergy when your body’s immune system overreacts to peanuts. Normally, your immune system helps protect you from germs and other harmful substances. But if ...