The common causes of nosebleeds are nasal capillary hemangioma, dry rhinitis, deviated nasal septum and so on. 1. Nasal capillary hemangioma: Nasal capillary hemangioma is a common benign tumor, after the rupture of the tumor, it will mainly show the symptoms of recurrent nosebleed and large amount of blood. 2. Dry rhinitis: rhinitis caused by dry external environment, the patient’s nasal mucous membrane surface dry crust shedding, mucous membrane rupture, such as accompanied by capillary damage will appear more nosebleed phenomenon. 3. Nasal septum deviation: various types of nasal septum bone and cartilage deviation can lead to the surface of the mucous membrane is thin, in the physical and chemical factors under the stimulation of the mucous membrane breakage, nosebleed, more difficult to stop. When the nose bleeds a lot, should consult the doctor in time, after the systematic examination to clarify the diagnosis.