Nosebleeds that cannot be stopped may be caused by ruptured arteries in the nasal cavity, blood disorders, nasal tumors and other diseases, but you cannot tell which disease is the precursor by this symptom. 1. Rupture of arterial vessels in the nasal cavity: when the nasal cavity is dry or suffers from trauma, it will lead to rupture of arterial vessels in the nasal cavity and bleeding, and this kind of bleeding is more rapid and usually difficult to stop. 2. Blood diseases: for example, leukemia, hemophilia, etc., which can lead to lack of coagulation factors or hypocoagulability, thus resulting in repeated nosebleeds. 3. Nasal tumors: for example, bleeding polyps in the nasal cavity, nasopharyngeal fibrous hemangioma, etc., which also cause nosebleeds that cannot be stopped. If the nosebleed can not be stopped, it is recommended to go to the otorhinolaryngology department to improve the nasal endoscopy examination, to clarify the cause of bleeding, and actively treat the cause of the disease.