The nasal cavity and the oral cavity are connected, and it is normal to spit out bloody sputum from the oral cavity after a nosebleed. It is normal to spit out sputum with blood from the mouth after a nosebleed because the nasal cavity and the oral cavity are connected, when there is a nosebleed, if there is no good pressure to stop the bleeding, or the patient tilts the head so that the nosebleed does not flow out, the nosebleed may flow from the nasopharynx to the throat, and then when spitting or spitting, it will be spat out together, presenting the phenomenon of sputum with blood in the phlegm. In the event of a nosebleed, it is necessary to immediately pinch both sides of the nose toward the nasal septum and then apply pressure to stop the bleeding. Then you need to pay attention to, as far as possible, tilt your head forward, face down and open-mouth breathing, do not raise your head, tilting your head will make the nosebleed flow into the throat and swallowed to the stomach, or flowed into the mouth and then spit out, the patient may mistakenly think that it is vomiting blood, causing panic. If the patient has frequent nosebleeds, or spits up bloody phlegm even when there are no nosebleeds, it is recommended to go to the hospital for examination in a timely manner to identify the cause of the disease and actively cooperate with the treatment.