Do a lot of people get allergic rhinitis?

Yes: About 20% of the population have some level of allergic rhinitis; many can be self-treated with occasional over-the-counter medications, some need to be treated by their primary care doctor, and at least 20% of those are so allergic that they should see an allergist.

~30% of folks.: Around 30% of the general population and about 50% of people with chronic rhinitis.