Nosebleeds in adults often occur in relation to nasal mucous membrane injury, nasal mucous membrane disease, nasal septum deviation, blood disease, cardiovascular system disease and other reasons. 1. Nasal mucous membrane injury: forceful nose picking, sleeping and squeezing, etc. can cause nasal blood vessel rupture and nosebleed. 2. Nasal mucosa diseases: common acute rhinitis, atrophic rhinitis, dry rhinitis and other diseases. Due to the nasal mucosa congestion, ulceration, dryness and other changes, resulting in increased brittleness of the capillaries in the nasal cavity, easy to cause rupture and bleeding. 3. Nasal septum deviation: Nasal septum deviation is caused by abnormalities in the developmental structure of the nasal cavity. As the mucous membrane in the lesion area is relatively thin, it is easy to cause the mucous membrane to become dry, resulting in capillary rupture and bleeding. 4. Blood diseases: when the body suffers from thrombocytopenia, allergic purpura, hemophilia, diffuse intravascular coagulation and other diseases, it can also cause nasal bleeding, which is often accompanied by more bleeding, not easy to stop bleeding and other symptoms. 5. Cardiovascular system diseases: if you suffer from hypertension, vascular sclerosis and other diseases, due to emotional excitement, excessive excitement can be caused by nasal blood vessel rupture, resulting in nasal bleeding. Often accompanied by headache, dizziness and other corresponding symptoms. There are other possibilities for adults to suffer from nosebleeds, and they need to go to the hospital for examination and treatment in time to avoid delaying their condition.