The phenomenon of nosebleed may be nasal mucous membrane injury, may also be chronic rhinitis sinusitis and other nasal inflammation, nasal septum deviation, nasal swelling or systemic diseases and other factors. 1. Nasal mucous membrane injury: digging the nostrils, etc. leads to rupture of the mucous membrane blood vessels in the nasal cavity, so there may be a total nosebleed phenomenon. 2. Chronic rhinitis and sinusitis: because the nasal mucosa is stimulated by purulent secretions for a long time and lead to nasal cavity erosion, so there will be the phenomenon of nosebleed. 3. Nasal septum deviation: Nasal septum deviation leads to local mucous membrane thinning, airflow stimulation easily leads to local mucous membrane erosion, resulting in nasal bleeding. 3. Nasal mass: benign and malignant tumors of nasal cavity, such as a kind of fibro-angioma growing in nasopharynx, whose typical symptom is recurrent nosebleed. 4. Systemic diseases: if the body suffers from hypertension, leukemia and other systemic diseases, the phenomenon of nosebleed may occur due to factors such as increased arterial and venous pressure or blood clotting dysfunction. There are many other causes of nosebleeds, so it is recommended that you go to the hospital in time to find out the cause of the problem and actively cooperate with your doctor.