Heavy nosebleeds in adults may be due to traumatic factors, nasal septum diseases, tumors, cardiovascular diseases, and blood diseases. 1. Traumatic factors: because trauma and surgery may lead to deviated nasal septum and damage to the base of the cranial fossa, so there will be bleeding. 2. Nasal septum diseases: these include nasal septum ulcers, nasal septum perforation, and deviated nasal septum, and these lesions may have symptoms of nosebleed. 3. Tumors: tumors can also cause nosebleeds, including inverted papilloma, hemangioma, fibroangioma, lymphoma, adenocarcinoma and sarcoma. 4. Cardiovascular diseases: including hypertension, heart failure, arteriosclerosis, pulmonary edema, mitral stenosis, all of them may have bleeding phenomenon, and the amount of bleeding is relatively large, which is not easy to stop bleeding. 5. Blood diseases: aplastic anemia, leukemia, thrombocytopenic purpura, hemophilia may cause massive nosebleeds. There are many reasons for heavy nosebleeds in adults, and there is no way to stop them in a short time, so it is recommended to go to the hospital in time to receive examination and treatment.