Causes of Pollen allergy
Pollen allergy: Related Medical Conditions
To research the causes of Pollen allergy, consider researching the causes of these
these diseases that may be similar, or associated with Pollen allergy:
Pollen allergy: Causes and Types
Causes of Types of Pollen allergy: Review the cause informationfor the various types of Pollen allergy:
Causes of Broader Categories of Pollen allergy: Review the causal information about the various more general categories of medical conditions:
What causes Pollen allergy?
Article excerpts about the
causes of Pollen allergy:
Plants produce microscopic round or oval pollen grains to reproduce. In some
species, the plant uses the pollen from its own flowers to fertilize itself.
Other types must be cross-pollinated; that is, in order for fertilization to
take place and seeds to form, pollen must be transferred from the flower of one
plant to that of another plant of the same species. Insects do this job for
certain flowering plants, while other plants rely on wind transport.
The types of pollen that most commonly cause allergic reactions are produced
by the plain-looking plants (trees, grasses, and weeds) that do not have showy
flowers. These plants manufacture small, light, dry pollen granules that are
custom-made for wind transport. Samples of ragweed pollen have been collected
400 miles out at sea and 2 miles high in the air. Because airborne pollen is
carried for long distances, it does little good to rid an area of an offending
plant--the pollen can drift in from many miles away. In addition, most
allergenic pollen comes from plants that produce it in huge quantities. A single
ragweed plant can generate a million grains of pollen a day.
The chemical makeup of pollen is the basic factor that determines whether it
is likely to cause hay fever. For example, pine tree pollen is produced in large
amounts by a common tree, which would make it a good candidate for causing
allergy. The chemical composition of pine pollen, however, appears to make it
less allergenic than other types. Because pine pollen is heavy, it tends to fall
straight down and does not scatter. Therefore, it rarely reaches human noses. (Source: excerpt from Something in the Air Airborne Allergens: NIAID)
Related information on causes of Pollen allergy:
As with all medical conditions,
there may be many causal factors.
Further relevant information on causes of Pollen allergy may be found in: