"Hay Fever" is a term which has come to describe the symptoms of allergic rhinitis, especially when it occurs in the late summer. However, the symptoms are not caused by hay (ragweed is one of the main culprits) and are not accompanied by fever. So physicians prefer the term "allergic rhinitis" because it's more accurate. Similarly, springtime symptoms are sometimes called "rose fever," but it's just coincidental that roses are in full-bloom during the grass-pollinating season. Roses and other sweet-smelling, showy flowers rely on bees, not wind, for pollination, so not much of their pollen gets into the air to cause allergies.
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