There are various causes of nosebleeds in small children. The most common cause is due to dry air and increased brittleness of the nasal mucosa causing nasal blood vessels to rupture and bleed. Secondly, it is due to inflammation of the nose caused by various colds and infections, which can cause blood vessels to rupture and bleed. In addition, children have a bad habit of picking their noses, which can also stimulate the nasal blood vessels to rupture and bleed. Also, if a child has frequent nosebleeds, he or she should go to the hospital in time to check the blood system, which may be thrombocytopenia or hemophilia, or even leukemia. Through the examination, the diagnosis can be clarified and symptomatic treatment can be carried out. In addition, children should be handled properly when they have a nosebleed. First of all, the child’s head should be tilted to the side so that the blood can be discharged out of the body to avoid choking and endangering the child’s life due to the backward flow of blood into the trachea.