Epistaxis (nosebleed) Etiology: 1、 Local causes: 1) Trauma: mucosa laceration blood vessel injur 2) Inflammation of nose and sinus 3) Diseases of septum 4) Tumor: nasal cavity tumor sinus tumor angiofibroma of nasopharynxEpistaxis (nosebleed) Etiology： 1、 Local causes： 1）Trauma：mucosa laceration blood vessel injury 2）Inflammation of nose and sinus 3）Diseases of septum 4）Tumor：nasal cavity tumor sinus tumor angiofibroma of nasopharynx