| Namespace | MPheno.ontology | Obsolete | false |
| description | increase in the amount per unit of blood of histamine, an amine derived from the decarboxylation of histidine that is involved in local immune responses, in regulating physiological function in the gut, and that acts as a neurotransmitter for the brain, spinal cord, and uterus; histamine is involved in the inflammatory response and has a central role as a mediator of itching |
