There are several reasons for frequent nosebleeds: First, trauma: nasal and sinus trauma, which can be combined with fractures of the base of the anterior cranial fossa or the base of the middle cranial fossa, injury to the anterior sieve artery and internal carotid artery. Generally bleeding is more intense and often life-threatening. Nose and sinus surgery damage to blood vessels, not timely found and not properly dealt with, frequent nose picking, forcefully swinging the nose, violent sneezing, nasal foreign body, transnasal intubation, as well as rapid changes in air pressure and other damage to the nasal mucosa of the blood vessels, can cause bleeding. Inflammation of nasal cavity and sinus, all kinds of nasal cavity and sinusitis can cause mucosal lesions, damage to blood vessels and bleeding. Third, tumor: nose, sinus and nasopharynx malignant tumor ulceration bleeding, early often repeated small amount of bleeding, late destruction of large blood vessels can lead to hemorrhage. Vascular benign tumors, such as nasopharyngeal angiofibroma and hemangioma bleeding is generally more intense, for nosebleeds, not only a large amount of bleeding need to pay attention to, a small amount of bleeding should be more vigilant. When a small amount of nosebleed is found, the cause of bleeding must be carefully found. Fourth, lesions of the nasal septum, various deviations of the nasal septum, nasal septal erosion, ulceration and perforation, is a common cause of bleeding. Fifth, there are a number of systemic diseases can also cause nosebleeds, such as vascular sclerosis, hypertension, vitamin deficiencies, blood disorders, thrombocytopenia and so on. Therefore, nosebleed can not only find the cause from the localization, but also should carry out the necessary examination of the whole body, in order to find out the real cause for treatment.