Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Histamines are a naturally produced chemical that form an important part of the immune system, digestion and act as a neurotransmitter. The histamines for the immune system are produced by mast cells and certain types of white blood cells. As part of the immune response, they affect blood vessels to allow white blood cells and certain proteins involved in the immune response to more easily enter the vessels to fight off any foreign tissue. As a side effect, this results in inflammation, constriction of the bronchial tubes, and the increased production of mucous.