By any chance have you once endured acute rhinitis? Conceivably did you eliminate the issue? Certainly you recovered! You can not treat a common cold directly, but your immune system typically creates immunity to a certain cold infection within a couple of weeks. We call that cured by your own immunity!

Grownups have in the past had a lot of the runny nose viruses. Parents have developed immunity to the ones they have had. Therefore there are not numerous runny nose viruses existing for adults to catch. That is why grownups only succumb to a couple of colds per year whereas kids acquire a dozen runny noses annually.
https://www.openlearning.com/u/arlinda-qp9g7i/blog/Hpv16NaturalTreatment/