Blood from the nose, which can range from light to heavy, is the most common sign of a nosebleed. Blood can be seen coming out of either nostril (usually, only one nostril is affected). If you get a nosebleed while lying down, you may notice liquid at the back of your throat before the blood comes out of your nose. It is advisable to avoid swallowing the blood because it may cause nausea and vomiting. Severe nosebleeds necessitate medical care right away. The following are some things to keep an eye out for: