my well be some type of stones eg ureteric etc
he better get that checked out; can damage the kidneys on the long run, he does not known about it yet

yes if uti u can get painful stinging urination (pardon my bad english up there; was changing some words forgotten to change others)
however, a male shouldnt get a UTI so easy.. even once would need a urological investigation; for those who practice anal sex with their girlfriends or boyfriends, it is mandatory to ''clear out'' first
as long u dont have stones, then it is acceptable to approach a ''wait-and-see'' policy
if its a UTI, and you couldnt find an explanation why, then no wait-and-see for you
see first how it goes but dont be afraid to see a doc