Hay fever is an inflammatory reaction to allergens in the air.
Hay fever or hayfever may also refer to: Hayfever (song), 1993 song by Trashcan Sinatras Hayfever (film), 2010 romantic comedy Hay Fever (play), 1924 comic play by Noël Coward Hay Fever (The Green Green Grass), episode of The Green Green Grass
See also Hay fever weed