Hay fever is an allergic disorder characterized by an exaggerated immune response to pollen grains and other substances.
Also known as allergic rhinitis, there are two types:
- seasonal, which occurs only during the time of year in which certain plants pollinate
- perennial, which occurs all year round.
Typically, if you suffer from hay fever in the spring, you're probably allergic to tree pollens. Grass and weed pollens may be causing your allergic reaction during the summer. In autumn, weeds may plague you, and fungus spores cause problems primarily from late March through November but can be present year round.
Keyword: hay fever