If it’s only slightly foamy and not all the time it’s fine. Especially for guys if you’ve ejaculated recently. But if it’s real foamy frequently, yeah might want to check it out. Or if it’s particularly discolored or smelly that you can’t attribute to your diet.

Also fun fact, apparently if you go running with a completely empty bladder, you can bruise it, and you get reddish-brown, foul-smelling urine from some of the dead cells being purged. It’s a little terrifying to see, ask me how I know.