I have a nose bleeding?

About nosebleeds: Nosebleeds can be from many things that cause one of the little veins on the inside of the nose (usually the middle septum) to crack and leak temporarily. Heavy breathing in sports, hot or cold air, allergies, nose-picking, colds, a toy in the nose, etc., are some of the causes of nosebleeds. She who bleeds "too often" or "too long" can have her blood checked to see if her blood clots too slowly.