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.
Note: All information is for educational purposes only. For specific medical advice,
diagnoses, and treatment, consult your doctor.
© 1995-2009 The Nemours Foundation/KidsHealth. All rights reserved.