Allergy is a disorder of the immune system that is often called atopy.
Allergic reactions occur to environmental substances known as
allergens; these reactions are acquired, predictable and rapid.
Strictly, allergy is one of four forms of hypersensitivity and is
called type I (or immediate) hypersensitivity. It is characterized by
excessive activation of certain white blood cells called mast cells
and basophils by a type of antibody, known as IgE, resulting in an
extreme inflammatory response. Common allergic reactions include
eczema, hives, hay fever, asthma, food allergies, and reactions to the
venom of stinging insects such as wasps and bees.
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