Patients with nasal polyps experiencing nosebleeds can have many causes. It might be due to hemorrhagic polyps, erosion of the nasal mucosa, dry nasal cavities, or rupture of small blood vessels. Some patients may have sinusitis accompanying their nasal polyps, with significant inflammatory responses that could also lead to nosebleeds. However, it's necessary to check for other conditions, such as nasopharyngeal angiofibroma, malignant tumors in the nasal cavity or sinuses, nasopharyngeal carcinoma, or blood disorders like coagulation dysfunction and thrombocytopenia. It is advisable to visit an ENT specialist and undergo nasopharyngoscopy, sinus CT scans, blood tests, and coagulation function tests to make an accurate diagnosis.