Nosebleeds in children are related to diseases such as acute sinusitis, leukemia, or environmental factors. 1. Acute sinusitis: acute sinusitis can lead to more fragile nasal mucosa, nasal mucosal erosion, ulceration and bleeding symptoms. Rinsing the nasal cavity can effectively remove nasal secretions and improve the microenvironment of the nasal mucosa. Local glucocorticoids (budesonide) and other drugs can be used. 2. Leukemia: Hematopoietic system diseases can also cause nosebleeds, such as leukemia. 3. Environmental factors: The nasal mucosa is easy to rupture and bleed when it is dry in the fall and winter seasons, or when it lives in a dry environment for a long time. When bleeding, it is recommended to press the nose with fingers. Children may also have other causes of nosebleeds, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment, the above medication as prescribed by the doctor.