First, poor blood pressure control, some hypertensive patients usually do not standardize the medication, resulting in blood pressure has been in a relatively high state, which can lead to nasal vascular sclerosis, in the case of constipation or excessive force triggered by a sudden increase in blood pressure, can trigger nasal bleeding; second, the nasal cavity itself, such as dry rhinitis, atrophic rhinitis Third, diseases of the blood system, such as primary thrombocytopenia, structural and functional defects of the blood vessel wall, vitamin K deficiency, coagulation dysfunction and other diseases, can cause nosebleeds, and the improvement of blood routine and coagulation analysis can help to make a clear diagnosis; fourth, serious liver disease, patients with serious liver disease because The reduction of coagulation factors synthesized by the liver can also cause nosebleeds, and examination of liver function can help clarify the diagnosis.