Why do nosebleeds start?

A nosebleed is just what it sounds like: it’s when blood comes out of your nose. Lots of people get nosebleeds, but what causes them? We asked pediatrician Emma Gerstenzang to help us find the answer. Got a scent-sational question? Send it to us at BrainsOn.org/contact and we promise we won’t turn our noses up at it! See omnystudio.com/listener for privacy information.