The common causes of frequent nosebleeds in children include climatic factors, inflammation of the nasal cavity and blood system diseases. 1. Climatic factors: especially in the fall and winter climate is dry, easy to cause the nasal mucosa dry, and the capillaries in the nasal cavity is more fragile, which in turn leads to frequent nosebleeds in children. 2. Nasal inflammation: especially allergic rhinitis, when inhaling dust, pollen and other allergens, it is easy to lead to the expansion of the nasal mucosa, capillaries, which in turn makes the nasal cavity itchy, runny nose and other uncomfortable symptoms, which can easily induce the child to pick his nose, rubbing his nose, and so it is easy to lead to frequent nosebleeds. 3. Blood system diseases: for example, abnormal coagulation mechanism, thrombocytopenia, etc., can also lead to frequent nosebleeds, which need to improve the blood routine, coagulation four to clarify the diagnosis. In conclusion, if the child has frequent nosebleeds, it is recommended to go to a regular hospital as soon as possible, in order to treat the cause of the disease.