An important medical research question, not really resolved. Genetics, presence of other diseases, and other factors may affect it. Depends of course on what you mean by “so many” – 10% might not be called “so many” by many people.
Seems to be caused by genetics and/or environmental exposures with different individuals developing different reactions.
Plant pollens are usually airborne, which means that they are virtually inescapable during spring, summer and fall unless you remain indoors.
On the other hand, reactions from certain foods, animals, drugs, or molds occur only if you happen to encounter allergens confined to an object or area.
The apparent prevalence of pollen allergy may be attributable to the simple fact that pollen is less avoidable than other allergens.
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