Allergies
Would you like to know what lab results mean? DDxHub - Differential Diagnosis Hub helps to understand and explains your blood test.
Allergies |
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Would you like to know what lab results mean? DDxHub - Differential Diagnosis Hub helps to understand and explains your blood test. |
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All information on this page is intended for your general knowledge only and does not provide medical advice, diagnosis or treatment. See Additional Information |
Allergies are hypersensitivities, overreactions of the immune system to substances that do not cause reactions in most people. Hypersensitivities are grouped into four types, I through IV. These classifications are based, to some extent, on what parts of the immune system are activated and how long it takes for a reaction to occur. The two types of hypersensitivities commonly associated with the term "allergies" are type I immediate hypersensitivities, in which antigens (allergens, foreign substances) combine with specific IgE (immunoglobulin E) antibodies to cause local and sometimes systemic reactions, usually within minutes; and type IV delayed hypersensitivities, reactions caused by the interactions of antigens with specific sensitized T lymphocytes instead of antibodies.
