Nosebleeds in children can be excluded from the diagnosis of leukemia by routine blood tests and bone marrow tests. Nosebleeds in children are relatively common. Nosebleeds in children may be related to dry air, inflammation of the nasal cavity, etc. They are not necessarily leukemia, and can be initially identified by checking routine blood tests. If the blood routine is found to be highly abnormal, bone marrow examination is also needed to clarify the diagnosis and typing of leukemia. If children have frequent nosebleeds, accompanied by anemia, joint pain, etc. should improve the relevant examination, if diagnosed with leukemia, it is recommended to regulate the treatment as early as possible in order to reduce the adverse effects of the disease.