Hooikoors of rhinitis vasomotorica (rhis is die Griekse woord vir neus en vasomotorica het betrekking op die verwyding van bloedvate) is ´n oorgevoeligheidsreaksie van die neusslymvlies en bindvlies op sommige stuifmeelsoorte.
Dit word gekenmerk deur waterige afskeiding uit die neus, genies, tranende oë en hoofpyn.
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