Nosebleeds can be caused by a variety of reasons, including nasal diseases (deviated septum, rhinitis, etc.), hematologic diseases (leukemia, hemophilia, etc.), and external factors (trauma or frequent picking of the nose, etc.). The physician should take appropriate treatment measures and methods according to the different causes of the disease. 1. Nasal diseases: children with deviated nasal septum, allergic rhinitis and other diseases may also show frequent nosebleeds, accompanied by clinical symptoms and manifestations of the corresponding diseases. 2. Blood system diseases: For example, if the child suffers from leukemia, hemophilia and other diseases, due to hematopoietic dysfunction and coagulation dysfunction, frequent nosebleeds may occur, and may be accompanied by anemia, fever, and infections. 3. External factors: for example, if the nose is hit by external force, or the child often picks his nose, the nasal mucosa can be damaged, resulting in rupture of the nasal mucosal blood vessels and bleeding. Children always have nosebleeds may also have other reasons, it is recommended to take the child to the hospital in a timely manner, a clear diagnosis of the cause of the targeted treatment, you can not just randomly use drugs, so as not to delay the condition.