By chance have you once had a common cold? Perchance did you recover from the infection? Obviously you survived it! You cannot heal a runny nose itself, however your system typically establishes resistance to a particular cold infection within a couple of days. That is called being healed by your personal immune response!Adults have already had a lot of the runny nose infections. Parents have developed resistance to the viruses they have actually had. Therefore there are not quite as many runny nose viruses remaining for parents to catch. That is why adults only get infected with a couple of colds annually and children acquire a dozen colds annually.