Though most nosebleeds are mild and benign, they shouldn’t happen. Experts weigh in on when to see a doctor The definition of a nosebleed is simply bleeding from the blood vessels in the nose. Learn the causes, warning signs, when to worry, and how to stop a bloody nose. Most nosebleeds are harmless and easy to stop, but some signal a deeper issue. Learn what causes them, how to handle one, and when to see a doctor. A nosebleed, also known medically as epistaxis, is bleeding from the nasal cavity caused by rupture of small blood vessels in the nasal mucosa. [1] Most cases are minor and stop spontaneously with simple first-aid or medical care. In some cases, blood may flow down into the stomach, and cause nausea and vomiting. [8] In more severe cases, blood may come out of both nostrils. [9] Rarely. Nosebleeds usually aren’t serious, but knowing how to stop the bleeding and treat your symptoms is important. Learn how to prevent and treat nosebleeds. Read about the causes of nosebleeds, how to treat them at home and when you should get medical advice. Epistaxis is the medical term for a nosebleed. Learn about the most common causes of nosebleeds and when to worry. (Hint: not very often.) Get the facts on nosebleeds, which are common in adults and children between the ages of 3 and 10. We’ll explain the two different kinds of nosebleeds, anterior nosebleeds and posterior. Learn about possible causes of a nosebleed, self-care steps to take if you get one and when to seek medical care. When does a nosebleed require medical attention? Know the signs of a serious issue and when to seek help.