The 11-year-old girl with a lot of nosebleeds may be caused by acute injury, inflammatory bleeding, nasal sinus tumors, systemic diseases and other factors. 1. Acute injury: for example, the nose area suffered an external blow, resulting in blood vessel damage, it will make the nosebleed flow more, may also be accompanied by pain, swelling and other symptoms. 2. Inflammatory bleeding: for example, acute rhinitis, acute sinusitis, etc., when the disease is serious, it will lead to a lot of nosebleeds, which may be accompanied by nasal congestion, sneezing, loss of smell and other symptoms. 3. Systemic diseases: for example, hemophilia and other blood system diseases, will make the girl flow a lot of nosebleeds, and will recur. There may also be bleeding from the mouth, bleeding gums, skin bruising, hematuria, bloody stools and other symptoms. An 11-year-old girl with a lot of nosebleeds accompanied by other discomforts is recommended to seek medical examination and treatment in time to avoid delaying the condition.