The common causes of nosebleeds in 8-year-old girls at two or three o’clock at night are environmental dryness, chronic rhinitis and blood system diseases. 1. Dry environment: If the indoor environment is too dry, it is easy to lead to nasal mucosa dryness, erosion, and then make the nasal capillary rupture, resulting in nighttime nosebleeds. It is recommended that a humidifier be placed in the child’s bedroom to improve indoor humidity. 2. Chronic rhinitis: chronic rhinitis can lead to dry nasal mucosa, resulting in increased capillary fragility, and the front 1/3 of the nasal septum in the area of capillary aggregation, so chronic rhinitis can cause this area of blood vessel rupture, and then appear at night nosebleeds. 3. blood system diseases: if the 8-year-old girl has leukemia, hemophilia and other blood diseases, can also be manifested in the phenomenon of frequent bleeding of the nasal mucosa, and the nosebleed is not easy to stop, it is recommended to improve the blood routine and coagulation function of the examination in a timely manner. 8-year-old girl at night two or three o’clock nosebleeds, there may also be other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.