Topic summary
Hay fever
Extracted from the Wikipedia article Allergic rhinitis.
Pollen-related causes
Allergic rhinitis triggered by the pollens of specific seasonal plants is commonly known as "hay fever", because it is most prevalent during haying season. However, it is possible to have allergic rhinitis throughout the year. The pollen that causes hay fever varies between individuals and from region to region; in general, the tiny, hardly visible pollens of wind-pollinatedplants are the predominant cause. The study of the dispersion of these bioaerosols is called aerobiology. Pollens of insect-pollinated plants are too large to remain airborne and pose no risk. Examples of plants commonly responsible for hay fever include: