Nosebleeds are usually from the nasal cavity, sinuses, nasopharynx. 1. Nasal diseases: nasal mucosal ulceration, erosion, seen in the lower part of the nasal septum in front of the Littell area; can also be seen in the nasal septum sphenoidal or torque protrusion, the middle turbinate anterior corresponds to the region of the nasal septum, the back of the middle nasal passages are prone to localized vascular exposure, resulting in bleeding; septal perforation, atrophic rhinitis, etc., can lead to nosebleeds. 2. Sinus diseases: maxillary sinus bleeding necrotic polyps, sinus malignant tumors can bleed due to tissue destruction. 3. Nasopharyngeal diseases: such as nasopharyngeal fibrous hemangioma, nasopharyngeal cancer and other disorders can bleed from the nasopharynx. Nosebleed, should be timely consultation and relevant examination, clear cause, under the guidance of the doctor treatment.