Nose bleeds need to be alert to inflammatory diseases of the nasal cavity, nasal septum deviation, nasal tumors, systemic diseases and so on. 1. Nasal inflammatory diseases: acute and chronic rhinitis, allergic rhinitis. Acute and chronic sinusitis, etc., can lead to nasal mucosal congestion, local mucosal erosion, nasal discomfort, increased nose blowing, can lead to nasal bleeding. 2. Deviated nasal septum; nasal septum bone and cartilage tissue to one side, the protruding part of the mucous membrane tension increases, the mucous membrane is easy to damage the bleeding, airflow stimulation of the mucous membrane can lead to erosion, in addition to the opposite side of the inferior turbinate compensatory hypertrophy, may also cause bleeding. 3. Nasal tumor: nasal hemangioma, sinus tumor and nasopharyngeal tumor, etc., all of which can cause nasal bleeding. 4. Systemic diseases: hypertension due to blood pressure fluctuations can lead to local blood vessel rupture and bleeding; thrombocytopenia, leukemia can lead to nasal bleeding due to thrombocytopenia, etc.; liver and kidney function abnormalities, due to coagulation disorders leading to nasal bleeding. It is recommended that patients with nosebleeds should consult a doctor in time for a clear diagnosis and treatment.