For patients of different ages, the causes of nosebleeds in the middle of the night may be different, clinically there are the following analyses: First, for children, most nosebleeds in the middle of the night are due to dry rhinitis, local erosion and ulceration of the nasal mucosa, or burning and prickly sensation in the nose causing children to involuntarily rub their nose and pick their nose while sleeping at night, thus inducing local bleeding, clinically common Second, for some elderly patients, such as those with underlying diseases, especially hypertension, coronary artery disease, atherosclerosis and other related underlying diseases, during nighttime sleep, due to fluctuations in blood pressure and elevated blood pressure, resulting in increased pressure in the local blood vessels, resulting in ruptured blood vessels, clinically common bleeding sites include the Lee’s artery area, the Lower nasal tract, olfactory fissure and other bleeding sites, generally this kind of bleeding is more, most patients need to go to the hospital as soon as possible to stop the bleeding; third, for some young or middle-aged patients, nasal bleeding may be related to the patient’s drinking, smoking, bad habits, frequent late nights, fire, work stress and other triggering factors, this kind of often also induced by the dryness of the nasal mucosa, and the rupture of the nasal blood vessel wall Bleeding is also related; fourth, there are individual patients who have blood-related diseases also prone to bleeding, this kind of bleeding in addition to nighttime bleeding, there will also be bleeding during the day.