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. Nosebleeds also commonly are caused by trauma, such as nose picking, forceful blowing of the nose, or severe facial trauma from an automobile accident or contact sports. Symptoms of a nosebleed Nosebleeds usually involve one nostril, but occasionally both nostrils are involved. 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. Epistaxis is the medical term for a nosebleed. Learn about the most common causes of nosebleeds and when to worry. (Hint: not very often.) Though most nosebleeds are mild and benign, they shouldn’t happen. Experts weigh in on when to see a doctor Learn how to help a person experiencing a nosebleed with these steps from the Red Cross. Be prepared and sign up for a first aid course today! When does a nosebleed require medical attention? Know the signs of a serious issue and when to seek help. Learn about possible causes of a nosebleed, self-care steps to take if you get one and when to seek medical care. 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. Read about the causes of nosebleeds, how to treat them at home and when you should get medical advice.