Definition: Histamine

Definition: Histamine

Histamine

Histamine - a chemical found in some of the body's cells - causes many of the symptoms of allergies, such as a runny nose or sneezing. When a person is allergic to a particular substance, such as a food or dust, the immune system mistakenly believes that this usually harmless substance is actually harmful to the body. In an attempt to protect the body, the immune system starts a chain reaction that prompts some of the body's cells to release histamine and other chemicals into the bloodstream. The histamine then acts on a person's eyes, nose, throat, lungs, skin, or gastrointestinal tract, causing allergy symptoms. You've probably heard of antihistamine medications - these help to fight symptoms caused by the release of histamine during an allergic reaction.



This website is certified by Health On the Net Foundation. Click to verify.
This site complies with the HON standard for trustworthy health information: verify here.