Frequent nosebleeds in boys may be caused by local reasons such as nose picking, deviated nasal septum, nasopharyngeal fibroangioma, or systemic reasons such as blood diseases. 1. Local causes: often digging the nose and other bad habits, may make the nasal mucosa is damaged, may appear often nosebleed phenomenon; deviated septum, deviated part of the mucous membrane thinning, vascular fragility increases, easy to bleed, nasopharyngeal fibroangioma early bleeding is not much, sometimes only manifested in the blood in the snot, to be the tumor grows large, it is easy to appear repeatedly nosebleed situation. 2. Systemic causes: thrombocytopenic purpura, leukemia, etc., due to the quality or quantity of platelet abnormalities, easy to bleed; hemophilia and other coagulation mechanism abnormalities of the disease, there will be frequent nosebleed symptoms. Boys often nosebleed there are other possibilities, need to go to the regular hospital in a timely manner, clear cause, standardized treatment under the guidance of the doctor, so as not to delay the condition.