Allergies are a major problem in the United States. As many as 50 million people—about one in five—have allergies. This includes millions of children. If you have an allergy, your immune system treats whatever you are allergic to as a target, and attacks. It is this response that causes allergic symptoms that can range from mild to severe. Sometimes the symptoms are just annoying. Occasionally, they can be deadly.
Allergic reactions can affect your nose, throat, eyes, lungs, skin, stomach or intestines. Rarely, they can affect the whole body. Whenever you are exposed to something you are allergic to, your body will trigger an allergic response again. That is why it's important to know what you are allergic to and take steps to treat or avoid a reaction.