Children with fever and nosebleed may be related to sinusitis, influenza, leukemia and so on. 1. Sinusitis: mostly due to streptococcus, staphylococcus, pneumococcus infection caused by inflammation in the sinus area, which can show fever, nasal congestion, decreased sense of smell and other symptoms, and at the same time, inflammation can lead to damage to the mucous membrane blood vessels and then nosebleeds. 2. Influenza: mostly caused by influenza virus, it is easy to have high fever, when the nasal mucous membrane is dry when the fever is high, it is easy to have capillary rupture and cause nosebleed. 3. Leukemia: typical symptoms of anemia, fever, bleeding, etc., in which bleeding is common in the nasal cavity, which can lead to children with fever and nosebleeds. Children with fever and nosebleed can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.