Did the Fonz (Henry Winkler) know that mountain climbers often get nosebleeds at high altitudes because as the amount of oxygen in the air decreases and the air becomes drier, blood vessels inside your nose can crack and bleed? Apparently he did.

In one episode of “Happy Days,” when Fonz ends up sitting near the top of the cheap seats at a concert, he remarks, “A guy could get a nosebleed up here.”

And that's the origin of the term “nosebleed seats.”

For kids, nosebleeds aren't something to joke about. They are pretty common from ages 3 to 10 (due to dry air or nose-picking), and the remedies are the same as they are for a mountain climber: Sit or lean slightly forward and allow blood to exit the nose; then, firmly pinch the nose closed just below the upper bony part.

If you can, use a dark towel to wipe off the blood. That might make it less distressing for a child.

Then check to see if the bleeding has stopped after five minutes (15 for a mountain climber).

Don't pack a bloody nose with gauze or tissue unless it's a last-ditch effort to stop the bleeding before you head to an urgent care center. The reason: When you remove the tissue, you may remove a formed scab, and the bleeding can start again.

If a child's nosebleeds become chronic, see a specialist who may perform a cauterization. It's a safe and effective heat-sealing of a weak blood vessel.