+**Histamine** is a vital [organic compound](/wiki/organic_compound) found in living organisms. It acts as a local immune response mediator, triggering symptoms in [allergic reactions](/wiki/allergic_reaction), and also functions as a [neurotransmitter](/wiki/neurotransmitter) influencing sleep and arousal.
+## See also
+- [Allergy](/wiki/allergy)
+- [Immunity](/wiki/immunity)
+- [Antihistamine](/wiki/antihistamine)
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