Allergy
Medical term · A
An immune system reaction (for example, rash, fever, sneezing, or headaches) to something that is normally harmless.
Related terms
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Immune systemThe way the body defends itself against infection, disease and outside substances.
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Allergic rhinitisA seasonal or year-round allergic condition marked by sneezing, runny nose, and congestion. The most common type of allergy, it is caused by an IgE-mediated immune response to…
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Atopic rhinitisA seasonal or year-round allergy marked by sneezing, runny nose, and congestion.
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Challenge testingA way of testing for food allergy, usually in double-blind experiments in which neither patient nor doctor knows which food is taken in pill form.