Histamine
Medical term · H
A substance released by the immune system when it is exposed to an allergen. Histamines cause many allergy symptoms.
Related terms
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Immune systemThe way the body defends itself against infection, disease and outside substances.
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AllergenA substance such as fur, pollen, or dust that produces an allergic reaction.
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AllergyAn immune system reaction (for example, rash, fever, sneezing, or headaches) to something that is normally harmless.
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AntihistamineMedications that treat allergies and reduce symptoms such as sneezing and itching by blocking histamine, the substance in the body which causes these symptoms.