Histamine

Definition

Histamine is a compound released by cells in response to injury and in allergic and inflammatory reactions, serving as a mediator of itching, sneezing, and vasodilation. It plays a significant role in the body's immune response by signaling the surrounding tissue to react accordingly.

Related terms

Mast cells: Immune cells that release histamine and other substances during inflammatory and allergic reactions.

Inflammation:

A biological response to harmful stimuli, such as pathogens or damaged cells, characterized by redness, swelling, warmth, and pain.

Allergen: A substance that can cause an allergic reaction by stimulating the immune response more than necessary