A lot of nosebleeds come out of the mouth, mainly for several reasons: 1. If the bleeding is caused by the bleeding point at the front of the nasal cavity, many patients cannot see the bleeding point and only use cotton balls or toilet paper to block the front of the nostril to keep it from flowing out, but ignore the fact that stopping the bleeding is not clear, which can easily lead to fresh blood not stopping and flowing into the mouth, which is actually the most common clinical reason. 2. Because the middle and posterior end of the nasal cavity causes Bleeding, especially the posterior end of the nasal cavity has a gram’s vein plexus bleeding on the lateral wall. Because the bleeding is fierce and close to the oral cavity, it is easy to have nasal bleeding that leads to backflow of blood into the mouth and out of the mouth or into the stomach.