There are more reasons for nosebleeds in adult women: 1. In terms of environmental factors, if the outside temperature is too high, humidity is too low, and the air is dry, the dry air entering the nasal mucosa will also dry out the nasal mucosa, easily leading to rupture and bleeding; 2. Repeated bad nose digging habits will lead to nasal mucosa erosion, thus triggering nosebleeds; 3. The nosebleeds may be caused by hyperthyroidism, diabetes or other diseases; 5, the body itself has high blood pressure may also cause nosebleeds; 6, cold, cold-induced rhinitis or allergic rhinitis, blood system diseases, etc. may cause nosebleeds.