A 10-year-old child always has nosebleeds, which may be related to frequent nose picking, deviated nasal septum, leukemia and other reasons. 1. Frequent digging of the nostrils: due to the richness of the capillaries of the mucous membrane of the nasal vestibule, if the child has the bad habit of frequently digging the nostrils, it may damage the capillaries, which may cause nosebleeds. 2. Nasal septum deviation: it mostly occurs on the convex side of the deviation, where the mucous membrane is thinner and the tension is larger, which makes it easy to have nosebleeds. 3. Leukemia: If you have leukemia, it can cause abnormalities in the quality or quantity of platelets, leading to nosebleeds. It is recommended that parents take their children to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor, so as not to delay the condition.