3-year-old children often nosebleed may be related to the nasal mucosa dry, rhinitis, blood system diseases, etc., you can improve the nasopharyngoscopy, coagulation function and other related examinations, after a clear diagnosis, the use of medication under the guidance of the doctor. 1. Dry nasal mucosa: dry nasal mucosa, the capillaries in the nasal cavity are easy to rupture, which can easily cause nosebleed, you can give the child more water, supplement water, reduce the dryness of the nasal mucosa. 2. Rhinitis: with rhinitis, there are more secretions, when the secretions crust, it will be more hard, if the child picks his nose, it is easy to often nosebleed, you can give the child to use sea salt water nasal spray, relieve symptoms. 3. Blood system diseases: such as leukemia, hemophilia, etc. will also have frequent symptoms of nosebleed, this situation needs to do blood routine, coagulation function, bone marrow biopsy, immunohistochemistry and other tests to confirm the diagnosis. After the diagnosis is confirmed, chemotherapy drugs can be selected according to the type of the disease. If hemophilia is considered, coagulation factors can be supplemented as prescribed by the doctor. If a 3-year-old child’s nose bleeds frequently, it is recommended to take the child to the ear, nose and throat department of the hospital to complete the relevant examinations and find out the cause of the bleeding under the guidance of the doctor’s treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.