There are several reasons for frequent nosebleeds from the nose: I. Trauma: trauma to the nose and sinuses can be combined with fractures at the base of the anterior or middle fossa of the skull, damaging the anterior sieve artery and the internal carotid artery. The bleeding is usually more violent and often life-threatening. Nose and sinus surgery injury to blood vessels, not timely detection and not properly handled, frequent nostril digging, forceful nose swinging, violent sneezing, nasal foreign body, transnasal cannula and rapid changes in air pressure, etc. damage to the blood vessels of the nasal mucosa can cause bleeding. Second, inflammation of the nasal cavity and sinuses, all kinds of nasal cavity and sinusitis can cause lesions of the mucosa, damage the blood vessels and bleeding. Third, tumors: malignant tumors of the nose, sinuses and nasopharynx ulcerate and bleed, often repeatedly a small amount of bleeding in the early stage, and the destruction of large blood vessels in the late stage can lead to hemorrhage. Benign vascular tumors, such as nasopharyngeal angiofibroma and hemangioma bleeding is generally more intense. For nosebleeds, not only a large amount of bleeding needs attention, but a small amount of bleeding should be more vigilant. When a small amount of nosebleed is found, the cause of the bleeding must be carefully investigated. Fourth, lesions of the nasal septum, various deviations of the nasal septum, nasal septal erosion, ulcers and perforations are common causes of bleeding. Fifth, there are many systemic diseases that can also cause nosebleeds, such as vascular sclerosis, hypertension, vitamin deficiency, blood disorders, thrombocytopenia and so on. Therefore, when nosebleeds are caused, we should not only look for local causes, but also conduct necessary examinations on the whole body in order to find out the real causes for treatment.