The common causes of nosebleeds in children are environmental factors, bad habits, disease factors, trauma and nasal foreign bodies. 1. Environmental factors: if in the fall and winter seasons, due to the dry environment, the nasal mucosa is relatively easy to rupture bleeding, so there will be nosebleeds. 2. Bad habits: If the child has bad habits, such as often picking the nose with the hand, it is easy to lead to the thinning of the nasal mucosa, so there will be nosebleeds. 3. Disease factors: If the child suffers from certain diseases, such as upper respiratory tract infections, acute and chronic rhinitis, as well as abnormal coagulation function and nasal tumors, etc., it is also more likely to lead to nosebleeds. Children with nosebleeds are recommended to actively go to the regular hospital for examination, to clarify the specific causes, and actively follow the doctor’s instructions to deal with, so as not to delay the condition.