Nasal bleeding in young children is usually considered to be caused by fragile blood vessels in the nasal mucosa or the presence of blood system diseases. 1. Some children’s nasal mucosa blood vessels are shallow and fragile, when the weather is dry or low air pressure, it is easy for nasal bleeding to occur, in addition, if the children also exist in picking the nose, rubbing the nose and other actions or hit a hard object may cause nosebleeds. 2. If the toddler has partiality, picky eating leading to vitamin deficiency, etc., in addition, it can not be ruled out that the toddler has leukemia, thrombocytopenic purpura, aplastic anemia and other blood system diseases, which may lead to frequent bleeding in the nose. In addition, we cannot rule out the existence of nasal septum deviation, nasal foreign body or intranasal tumors and other diseases that cause nosebleed, in short, we should consult the doctor in time to clarify the diagnosis and take appropriate treatment.