﻿ Allergy Symptoms, Testing, and Signs of Allergies  Allergy
(Allergies)  Allergy facts    • The immune system is an
intricate system that defends the body against foreign invaders,
such as bacteria and viruses, while also surveying for
conditions such as cancer and autoimmunity.   • Allergens are
substances that are foreign to the body and can cause an
allergic reaction.   • IgE is the allergic antibody.   •
Allergies can not only develop at any age, but many individuals
also outgrow allergies over time.   • While environment plays a
role in allergy development, there is a greater risk of
developing allergic conditions if a person has a family history
of allergy, especially in parents or siblings.  Allergy overview
In this review, you will learn how allergy relates to the immune
system. You will begin understanding how and why certain people
become allergic. The most common allergic diseases are discussed
briefly in this article.  Reviewed on 11/26/2013