Nosebleeds in small children are considered to be related to trauma, environmental factors, and may also be due to problems such as abnormal coagulation function. 1. Trauma, if the child often digging the nose may lead to rupture of the mucous membrane of the nasal cavity, so the child may have a nosebleed symptoms. 2. Environmental factors, if the ambient temperature is high and the air is dry, it may lead to capillary rupture and such symptoms. 3. Abnormal coagulation function, some children with abnormal coagulation function may lead to bleeding, so the symptoms of nosebleed in small children, may also be accompanied by oral bleeding and other reactions. Children with 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.