Boys often nosebleed may be caused by environmental factors this situation is usually not related to the disease material, or due to rhinitis, nasal septum deviation, leukemia and so on. 1. Environmental factors: boys often nosebleeds may be in the dry weather for a long time, dusty environment, breathing through the nose when harmful substances will stimulate the nasal mucosa leading to frequent bleeding. 2. Rhinitis: Boys with frequent nosebleeds may be suffering from rhinitis, due to the stimulation of inflammatory factors, leading to discomfort in the nasal cavity and easily triggered by the symptoms of frequent nosebleeds. 3. deviated septum: boys often nosebleeds may be caused by deviated septum, due to changes in the structure of the nasal cavity, it is easier to lead to nasal mucosal damage and cause bleeding. 4. Leukemia: boys often nosebleeds may be suffering from leukemia, leukemia bone marrow infiltration can lead to a reduction in the number of platelets, in the external force is very easy to bleed, so do not rule out this reason. The above are the common causes of frequent nosebleeds in boys, clinically, such as aplastic anemia, immune thrombocytopenic purpura and other diseases can also lead to frequent nosebleeds in children, when there is an unexplained nosebleed, it is recommended to go to the hospital to perform the relevant tests to identify the cause.