Children always have nosebleeds, which may be caused by repeated picking of nostrils, dry nasal mucosa, severe deviation of nasal septum and so on. 1. Repeatedly digging the nostrils: some children have the bad behavior of repeatedly digging the nostrils, which can easily lead to nasal mucous membrane breakage, thus causing nosebleeds, especially when the nasal mucous membrane is ulcerated, once the scabs fall off, it will lead to nosebleeds. 2. Dryness of nasal mucosa: the air may be too dry, leading to dryness of nasal mucosa and increased fragility of capillaries, which may lead to nasal mucosa breakage and bleeding when slightly stimulated, such as blowing nose or rubbing nose. 3. Severe deviation of the nasal septum: If the nasal septum is severely deviated, the nasal mucosa will be impacted by the airflow, thus causing bleeding. Children always have nosebleeds, there may be other reasons, 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.