First, the main cause of nosebleeds? Nosebleed is generally divided into two kinds: one is blood in snot, often see a small amount of blood in nasal snot or sputum with blood in sputum when sputum, which may be the signal of malignant tumor in nose. In addition to blood in nasal mucus, malignant tumors may also have other symptoms such as nasal congestion and pus; nasopharyngeal carcinoma may also cause hearing loss, neck mass, diplopia and other symptoms. But sometimes acute and chronic rhinitis, sinusitis can also cause blood in the snot, so don’t be alarmed when you see blood in the snot, and go to the hospital for examination in time. Another kind of nosebleed is bleeding, usually caused by nasal mucous membrane erosion or dryness, small blood vessels broken, or nasal trauma; for the elderly, hypertension, arteriosclerosis is a common cause. In addition, some systemic diseases can also be manifested as repeated bleeding and bleeding, such as leukemia, thrombocytopenia, severe liver function damage and other coagulation function abnormalities. Second, how to deal with nosebleed? Keep calm and don’t panic; apply cold compresses on forehead, nose and neck to make blood vessels contract; pinch both sides of the nose with thumb and forefinger or use sterilized cotton to put pressure into the nasal cavity and breathe with mouth open; lower the head slightly downward and forward, don’t tilt the head back or lie on the back to avoid the blood in the nose flowing backward to the oropharynx; try to spit out the blood in the mouth, don’t swallow it so as to avoid stimulation of the stomach causing nausea and vomiting; if the bleeding can’t be stopped within ten minutes, immediately go to the hospital to have the blood flow stopped. If the bleeding cannot be stopped within ten minutes, go to the hospital immediately. How to treat nosebleed? Bleeding caused by dry nasal cavity, local drops of peppermint oil, vitamin AD and other oil drugs; bleeding caused by nasal mucous membrane erosion, use cotton swabs dipped in erythromycin or gentamycin ophthalmic ointment and other ointments coated in the front of the nasal cavity; bleeding from rupture of blood vessels in the nasal cavity or small angiomas, the accurate and reliable method is to find the bleeding point under the endonasal endoscopy, electrocoagulation to stop the bleeding; the bleeding of a larger number of emergencies need to be carried out in the front and back of the nostril tamponade; the middle-aged and old-aged patients with large amounts of nasal bleeding, hypertension should be considered If there is a large amount of nosebleed in middle-aged or old-aged patients, we should consider the factor of high blood pressure, and need to actively monitor the blood pressure and antihypertensive treatment; Repeatedly, if there is blood in the snot or sputum, we need to carry out relevant examinations to exclude the malignant tumor of the nose. Nosebleeds caused by systemic diseases, in addition to the treatment of primary diseases, can take the Chinese patent medicine of clearing heat and moistening dryness. What are the common tests for nosebleed? Nosebleed is routinely examined by anterior rhinoscopy, and nasal endoscopy is feasible when deep nasal lesions are considered; sinus CT is feasible to exclude sinus diseases; when systemic diseases are considered, blood routine, liver and kidney function tests are feasible. How to prevent nosebleed? Avoid nose picking in daily life, and avoid eating tobacco, alcohol, spicy and stimulating food; for those who suffer from hypertension, pay attention to the fluctuation of blood pressure; take effective hygiene precautions when exposed to harmful gases; pay attention to the working and living environments not to be too dry, high temperature and dusty; avoid blowing your nose when you have colds and flu and sneeze as much as possible, so as not to damage the blood vessels of the mucous membrane by exerting oneself.