There are many causes of nosebleeds which can be categorized into local and systemic causes, and rhinitis is only one of the causes, which cannot be determined by nosebleeds alone, and requires further examination. 1. Local causes such as trauma caused by external blows, non-specific inflammation of the nasal cavity and sinuses such as acute and chronic rhinitis, sinusitis, dry rhinitis, specific inflammation such as tuberculosis, leprosy, etc., septal diseases such as deviated septum, septal perforation, nasal tumors, nasal foreign bodies and other local causes can cause symptoms of nosebleeds. 2. The systemic causes of nosebleeds include cardiovascular diseases, such as hypertension, mitral stenosis, blood diseases, such as aplastic anemia, leukemia, etc., acute febrile infectious diseases, such as influenza, malaria, etc., severe nutritional disorders and vitamin deficiencies, as well as chemical poisoning and so on, all of which can cause nosebleed symptoms. Therefore, once a nosebleed occurs, it is necessary to go to the hospital to identify the cause and carry out targeted treatment.