Nosebleeds in children are mainly related to physiological factors, rhinitis, deviated septum and other reasons. 1. Physiological factors: nasal dryness causes damage to the mucous membrane inside the nose, thus causing nosebleeds, attention to moisturizing can be relieved. 2. Rhinitis: Inflammatory reaction occurs in the mucous membrane or submucous tissue of the nasal cavity caused by a variety of reasons. Under the stimulation of inflammation, the nasal mucous membrane breaks down and nosebleed occurs. 3. Deviated nasal septum: the nasal septum is bent and raised to one or both sides, thus causing nosebleeds, accompanied by nasal congestion, headache, tinnitus and other symptoms. There may be other reasons for nosebleeds, such as blood system diseases with abnormal coagulation function. It is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.