If an elderly person has sudden nasal bleeding, consider the following causes: 1. see if there is hypertension, long-term hypertension can lead to rupture and bleeding of the Wu’s plexus behind the nasal cavity. 2. see if there is diabetes, long-term diabetes, increased vascular fragility, the nasal mucosa is prone to rupture and bleeding. 3. there may be neoplastic formation in the nasal cavity, such as nasal inversion papilloma, nasopharyngeal carcinoma and other neoplastic diseases. 4. whether the elderly have blood disorders 5.Whether they take oral anticoagulants such as aspirin. These are the common causes of nasal bleeding common in the elderly.