Epistaxis, also known as rhinorrhea, is an acute symptom commonly seen in the outpatient clinics of the Department of Five Gastroenterology, and can be self-curing in mild cases, but can cause hemorrhagic shock or even life-threatening in severe cases. It can be extremely harmful to people, so when epistaxis is found, it is important to go to the hospital for further examination in time to facilitate later treatment. The following tests should be done to confirm the diagnosis of epistaxis: 1. For those whose bleeding has been suspended or has been stopped, the following tests should be performed: 1. Detailed medical history: including the recent history of colds and trauma, and the past history of recurrent rhinorrhea. For children with unilateral nasal bleeding, foreign bodies in the nasal cavity should be considered. For middle-aged and elderly patients, ask whether there is a history of hypertension and arteriosclerosis. 2. Identify the cause of bleeding as soon as possible: detailed examination of the local nasal cavity and nasopharynx should be performed, and X-ray plain film, CT scan, nasal and sinus endoscopy should be performed if necessary. For those with high fever, necessary blood and bacteriological examinations should be done to exclude blood diseases and acute infectious diseases. 3. Quickly determine the location of bleeding: Place a cotton pad containing 0.1% epinephrine in the bleeding nasal cavity, remove it after one minute, and look for the bleeding site under the nasal cavity. 2. X-ray examination is needed if necessary: If the bleeding occurs behind the deviated nasal septum, the posterior edge of the nasal septum, the posterior middle turbinate, the anterior and posterior ends of the inferior turbinate and the nasal floor and nasal wall, nasal endoscopy should also be performed to discover the exact site of bleeding with the help of nasal endoscopy. Sinus radiographs are feasible when time permits.