What Is an Allergy?
An allergy is an abnormal reaction of a sensitive person to certain substances, like food or drugs, heat, or physical stimuli, that by themselves are not harmful. It includes production of IgE antibodies and release of histamine what results in typical allergic symptoms: itch, hives, wet eyes, sneezing, runny nose, cough, eczema or, in severe cases, short breath or fainting.
Above is description of the IgE allergy.
