The underlying cause of nosebleeds is the rupture of capillaries in the nasal mucosa, which can be stopped by applying local cold compresses, pinching the nose to stop bleeding, or nasal tamponade, electrocoagulation and other measures. The cause of nosebleeds may be related to environmental factors, dry rhinitis, nasal septum deviation, etc., need to go to the hospital for further examination to clarify the cause of targeted treatment. 1. If a student has a nosebleed, the first thing he needs to do is to bury his head, pinch both sides of the nose to stop the bleeding, and use cold water or ice packs to apply cold compresses to the forehead or neck, which can mostly achieve temporary relief of bleeding. If the bleeding is more intense, it is recommended to go to the hospital in time, and may need nasal filling to stop bleeding or electrocoagulation to stop bleeding. 2. Common causes of nosebleeds (1) Environmental factors: Especially in summer, the weather is hot and dry, and if students participate in sports activities after school, they may be induced to rupture the mucous membrane of the nasal cavity and bleed. It is important to eat more, take more vitamins, avoid exposure to hot weather, and avoid strenuous exercise. (2) Dry rhinitis: it may be related to environmental factors, nutritional deficiency and other factors. Nasal mucous membrane secretion is reduced, dry and easy to bleed. Symptomatic treatment can be done by rinsing the nasal cavity with physiological sea salt water, cod liver oil drops and so on. (3) Deviated nasal septum: If the deviated nasal septum is serious, the mucous membrane of the deviated side of the nasal septum will have higher tension, and will bleed more easily when stimulated by other factors. For those with severe deviation, surgery is needed. Students with nosebleeds may also be other causes, such as leukemia and other blood system diseases, it is recommended to consult a doctor in time to find out the cause of the cause of treatment, the above medication as prescribed by the doctor.