Nosebleeds in a 7-year-old girl may be caused by nasal mucous membrane injury or other nasal diseases, blood diseases and other systemic diseases. The most common cause of nosebleeds in 7-year-old girls is mucosal injury in the nose leading to blood vessel rupture and bleeding, mostly caused by dry nasal cavity and frequent digging of the nostrils with hands. In addition, some nasal diseases such as rhinitis, nasal polyps, nasal tumors can also cause nosebleeds. In addition, if the child has frequent nosebleeds and the bleeding is difficult to stop, you need to consider whether it is caused by blood diseases, such as thrombocytopenic purpura, hemophilia, and other coagulation disorders, coagulation factor deficiency. In addition when the child’s liver function is abnormal can also be manifested as frequent nosebleeds. The 7-year-old girl with nosebleeds is recommended to seek timely and standardized diagnosis and treatment when necessary.