ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ Allergy
Similar term(s): hypersensitivity, allergen, allergic reaction, allergic disease, allergic disorder.
Definition:
Allergies are inappropriate or exaggerated reactions of the immune system to
substances that, in the majority of people, cause no symptoms. Symptoms of the
allergic diseases may be caused by exposure of the skin to a chemical, of the
respiratory system to particles of dust or pollen (or other substances), or of
the stomach and intestines to a particular food.
Source & ©:
ACAAI
Allergy-Immunology
Glossary 
More:
An allergen is a substance that causes an allergy.
Related words: Asthma - Rhinitis To read about this term in context: GreenFacts Digest on Respiratory Diseases in Children:
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