Eighty-year-old people suddenly nosebleed, may be related to the dry weather, may also be due to increased vascular fragility, hypertension, coagulation dysfunction and so on. 1. Dry weather: if the area where the eighty-year-old man lives is too dry in the near future, and the old man fails to pay attention to reasonable supplementation of water, resulting in excessive dryness of the mucous membrane of the nasal cavity, and the more fragile capillaries of the mucous membrane of the nasal cavity may cause capillary rupture, and the phenomenon of a sudden nosebleed occurs. 2. Increased vascular fragility: 80-year-olds may be in the whole body vascular sclerosis phenomenon, easy to exist in diabetes and other systemic diseases, resulting in poor vascular compliance, resulting in thinning of blood vessels, if you are not careful a little bit of force to touch the nose, may cause the nasal mucosa in the blood vessel rupture, sudden nosebleed. 3. Hypertension: 80-year-old people with a history of hypertension, when the blood pressure fluctuation is elevated, especially when the magnitude of the elevation is large, it is easy to cause bleeding in the nasal mucous membrane, resulting in sudden nosebleed phenomenon, which can be accompanied by dizziness, headache and other symptoms. 4. Coagulation dysfunction: the elderly more cardiovascular and cerebrovascular diseases, the application of antiplatelet therapy, or due to the lack of coagulation factors and functional abnormalities caused by the typical symptoms of systemic bleeding tendency without a clear causative agent, and bleeding difficulties, such as sudden nosebleeds, but also accompanied by bleeding gums, local skin often have bleeding spots. Sudden nosebleeds in eighty-year-olds may also be caused by other reasons, and should be consulted as soon as possible to confirm the diagnosis of the cause, and then given targeted treatment.