Children’s summer nosebleeds may be related to the environmental temperature, but also may be triggered by trauma, abnormal blood clotting function and other factors. 1. Ambient temperature, if the ambient temperature is relatively high and the air is too dry, it may lead to dryness and rupture of the mucous membrane of the nose of the children, and therefore the symptoms of nosebleed will appear. 2. Trauma, if children often rub their noses or pick their noses, it may lead to damage to the mucous membrane of the nose, and therefore symptoms of nosebleed may occur. 3. Abnormal coagulation function, some children with abnormal coagulation function may experience spontaneous bleeding, thus resulting in children’s summer nosebleed symptoms. Summer nosebleeds in children may also have other causes, 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.