Children always have nosebleeds may be frequent nose picking, nasal foreign body and other factors, may also be dry rhinitis, nasopharyngeal cancer, leukemia, hepatitis and other reasons. 1. Frequent nose picking may cause local nasal mucous membrane breakage and bleeding; long-term lack of drinking water, environmental high temperature and dryness lead to nasal dryness, capillary rupture and bleeding easily, these are physiological phenomena. 2. Dry rhinitis: mostly related to congenital deformity of nasal structure, vitamin deficiency, chronic infection, environment and other factors, the nasal mucosa appears dry, congestion, secretion reduction and other changes, the capillaries in the nasal cavity of patients with this disease are fragile, easy to appear nosebleed when small stimuli such as rubbing nose, sneezing and so on. 3. Nasopharyngeal carcinoma: the most common malignant tumor of nasopharynx, in the middle and late stages, the proliferation of tumor cells leads to the occupation of nasal cavity, the function of normal tissues is seriously impaired, and the necrosis and bleeding of tumor tissues cause nosebleed. 4. Leukemia: malignant proliferation of cancerous cells in bone marrow hematopoietic tissues leads to the obstruction of the generation of other normal cells such as red blood cells, platelets, etc., and the reduction of platelet content in the body, blood clotting dysfunction, so it will be often caused by nosebleeds. 5. Hepatitis: small children with chronic hepatitis and other liver diseases lead to liver cell damage, liver synthesis of coagulation factors is blocked, resulting in blood clotting dysfunction, so often nosebleeds. Children always nosebleed may be related to a variety of factors, it is recommended to consult a doctor in time to clarify the diagnosis, symptomatic treatment.