Not everyone has allergies. However, in the United States, more than one-quarter of people under 18 years old have one.and that's a lot of people! Thankfully there are allergists to help keep us healthy. Allergists are doctors who specialize in several different kinds of illnesses, such as food allergies and seasonal allergies. Inside this volume, readers learn what these illnesses are and how an allergist can help people lead a normal life despite them.