Although seeing blood coming out of your noise can be alarming, most nosebleeds are not serious and can be managed at home. Some, however, should be checked by your doctor. For instance, if you have frequent nosebleeds, see your doctor. This could be an early sign of other medical problems that needs to be investigated. A few nosebleeds start in the back of the nose. These nosebleeds usually involve large blood vessels, result in heavy bleeding and can be dangerous. You will need medical attention for this type of bleed, especially if the bleeding occurs after an injury and the bleeding hasn’t stopped after 20 minutes of applying direct pressure to your nose.