Allergy involves an exaggerated response of the immune system, often to common substances such as foods or pollen.
The immune system is a complex system that normally 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 that cause an allergic reaction.
IgE is the allergic antibody.
Although many individuals outgrow allergies over time, allergies can also develop at any age, including during adulthood.
While the environment plays a role in the development of allergy, there is a greater risk of developing allergic conditions if a person has a family history of allergy, especially in parents or siblings.
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