Perhaps have you previously endured a cold? Peradventure did you eliminate the cold? Naturally you got over it! You can't heal an acute rhinitis directly, but your immune system typically establishes immunity to a certain cold virus within a few days. We call that being healed by your own immune response!Adults have in the past had a lot of the runny nose infections. Grownups have acquired immunity to the colds they have suffered from. Therefore there are not quite as many runny nose viruses existing for parents to catch. That is why grownups only get a few colds per year and kids acquire a dozen runny noses annually.