5-year-old children have nosebleeds mainly due to the following reasons: First, because the nasal mucosa is dry and children drink less water, so it is easy to have nosebleeds. Vitamin AD drops can be given to be dropped into the nose before bedtime to avoid dryness of the nasal mucosa, and at the same time, more water should be drunk and fed regularly in daily life. Second, because children are more active, they often touch their nose because of trauma or with their hands, which can easily lead to nosebleeds. After a nosebleed, local dryness and itching will occur, and children may touch it repeatedly, so it will lead to nosebleeds. Third, caused by disease, such as local breakage of nasal mucosa or coagulation dysfunction caused by thrombocytopenia, etc., which need to be treated under the guidance of ENT doctors in hospitals.