Nosebleeds in children may be related to local causes such as trauma and nasal septal diseases, or systemic causes such as blood diseases and febrile infectious diseases. 1. Local causes: such as impact and other traumatic injuries to the nose, nasal septum and other parts of the injury, can cause nosebleeds; deviated septum convex mucosa is thin, greater tension, easy to bleed. 2. Systemic causes: such as leukemia and other blood diseases with abnormal coagulation mechanism can cause nosebleed; such as scarlet fever and other febrile diseases, mostly due to high fever, nasal mucous membrane congestion, dryness, resulting in bleeding. Parents are advised to take their children to the hospital in time to clarify the cause of the disease, and carry out standardized treatment under the guidance of the doctor, so as to avoid delaying the condition.