What does histamine mean?
Histamine is a chemical messenger and biogenic amine produced by the body. It is released particularly by mast cells and basophils, two types of immune cells, and helps coordinate inflammation, blood-vessel responses, and allergic symptoms. It also has important roles in the nervous system and in the regulation of stomach acid. In an allergy, an allergen can prompt the immune system to release histamine, leading to sneezing, itching, hives, swelling, and other reactions. The word is therefore strongly associated with hypersensitivity, although its biological functions are much broader than allergy alone. In medicine and science, histamine refers both to the substance itself and to the signalling it performs. Understanding histamine has helped explain how antihistamine medicines reduce allergy symptoms and why certain foods or exposures cause reactions in susceptible people.
nounA biogenic amine and chemical messenger released by cells, especially mast cells and basophils, that helps regulate immune responses, blood vessels, and gastric acid secretion.
- A biogenic amine and chemical messenger involved in immune responses, blood-vessel activity, neurotransmission, and gastric acid secretion.
"The doctor suspected that a histamine reaction was causing the patient's sudden hives and swelling."
"Exposure to the allergen triggered a massive release of histamine in the patient's tissues."
"Researchers studied how histamine signals reach the brain and influence wakefulness and attention."
The plural is uncommon; when referring to the chemical substance, histamine is usually treated as an uncountable noun.
"The laboratory compared the effects of several synthetic histamines on blood vessels."
Histamine is often blamed for allergies, but it also helps the stomach make acid and acts as a vital signal in the nervous system.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does histamine come from?
The word histamine was formed in English in the early twentieth century from the Greek-derived prefix histo-, meaning “tissue,” and the chemical term amine. The tissue element reflects the compound's initial recognition as a substance found in body tissues. The name also connects histamine with other English words built from Greek histos, “tissue,” such as histology and histogenesis.
How histamine is actually used
Chiefly a technical or medical term. It refers both to the specific chemical compound and, in allergy-related contexts, to the biological effects of its release. In general writing, the term is more often encountered in discussions of allergies and intolerance than in everyday speech.
Easily confused with histamine
Histidine is an amino acid found in proteins, whereas histamine is the chemical messenger produced from histidine in the body.