Children with nosebleeds and spitting blood clots may be caused by dry weather, or may be atrophic rhinitis, nasal septum deviation and other diseases. 1. Dry weather: If the environment is dry, it can lead to dry nasal mucosa, which can cause nosebleeds, and when the nosebleeds reflux to the throat, there can be children with nosebleeds and spitting blood clots. 2. Atrophic rhinitis: atrophic rhinitis may be caused by long-term dust stimulation, heredity, infection and other factors. Children with atrophic rhinitis may have nosebleeds, and when the nosebleed flows back to the throat, the child may have nosebleeds and vomit blood clots. 3. Nasal septum deviation: Nasal septum deviation usually occurs on the convex side of the deviation, due to the thin mucous membrane, the tension is greater. When stimulated by the mucous membrane will appear erosion and bleeding, the child manifested as a nosebleed, but also spit blood clots. Children with nosebleeds and blood clots may also have other causes, such as thrombocytopenic purpura, etc. It is recommended to go to the hospital in time, complete the examination to determine the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.