Nosebleeds in a nine-year-old child may be caused by a foreign body in the nasal cavity, or by a deviated nasal septum, acute rhinitis and other diseases. 1. Nasal foreign body: If there are leeches or small toys in the child’s nasal cavity, it can lead to erosion of the nasal mucosa and cause nosebleeds. 2. Deviated nasal septum: The main cause of this disease is the uneven development of the cartilage of the nasal septum, which leads to the abnormal connection between bone and bone, and is related to heredity, nasal tumors, huge nasal polyps and other factors. Affected children will have headache, nasal congestion, nosebleed and other symptoms. 3. Acute rhinitis: this disease is caused by various respiratory viruses, such as rhinovirus, adenovirus, influenza virus, etc. However, it can also be secondary to bacterial infections such as Streptococcus pneumoniae, Haemophilus influenzae, etc. It can be triggered by factors such as malnutrition, vitamin deficiencies, and fatigue, which leads to symptoms of dryness of the nasal cavity, itchy nose, nosebleeds, sneezes, and so on in the affected children. In addition to this, you also need to consider that it may be caused by nasal injury, atrophic rhinitis, hemorrhagic fever and other diseases. When the nine-year-old child nosebleeds need to go to the hospital in time to improve the examination, to clarify the specific causes of the disease.