Nosebleed is a common clinical symptom, usually nasal bleeding with a small amount of bleeding, which can be significantly relieved after hemostasis. However, the following conditions need to be highly alert: 1. Repeated bleeding from one side of the nasal cavity or nasal discharge with blood and nasal congestion, which is most likely due to possible tumor in the nasal cavity itself, including benign hemangioma or malignant tumor. If there is nasal congestion with bleeding on one side of the nasal cavity, it is necessary to go to the hospital for consultation. Through the examination of nasal endoscopy, it is usually possible to see in detail what is going on in one side of the nasal cavity. If a foreign body grows, a biopsy should be given locally for pathological diagnosis. 2. Repeated bleeding from the posterior end of the nasal cavity in very large amounts, this bleeding is suspected to be caused by hypertension, and the patient can have a history of hypertension and repeatedly bleeding from the posterior end of the nasal cavity in large amounts, blood pressure monitoring must be performed. Patients with hypertension should have their blood pressure controlled in time so that the nosebleeds can be gradually relieved; 3. Repeated bleeding from both sides of the nasal cavity and examination reveals extensive bleeding from the mucous membrane of the nasal cavity should be alert to blood diseases or blood tumors, such as leukemia and hemophilia, and blood routine and blood tests should be performed.