Rhinorrhea, also known as epistaxis, is mostly caused by localized lesions in the nasal cavity, but we should not forget that systemic diseases can also cause it. Common causes of nasal bleeding include local mucosal erosion, deviated nasal septum, nasopharyngeal carcinoma and hypertension, arteriosclerosis, nephritis, hematologic disorders, etc. Most of the bleeding sites are in the bleeding-prone area in the lower part of the anterior nasal septum. In middle-aged and elderly people, nasal bleeding is often related to hypertension and arteriosclerosis, and the bleeding sites are found in the posterior part of the nasal cavity. In older people, if recurrent nasal bleeding occurs, it is necessary to consult a doctor to discharge nasal and nasopharyngeal tumors.