Nasoscopy is mainly to understand the condition of the nasal cavity, such as the condition of the nasal mucosa, whether there are new organisms, septal deviation, and the site of nosebleed. Nasal endoscopy can clarify the color of the nasal mucosa and whether there is erosion, whether there are new organisms in the nasal cavity; whether the inferior turbinate and middle turbinate are enlarged; whether there is any abnormal secretion in the middle and inferior nasal passages; some patients can see the openings of the nasolacrimal ducts through the nasoscopy, and even the drainage opening of the sinuses. In addition, it is possible to check whether a deviated nasal septum is present. If nasal bleeding occurs, the location of the bleeding can also be clarified. Rhinoscopy provides a very comprehensive view of what is going on in the nasal cavity. When abnormalities are found under rhinoscopy, further sinus CT examination should be performed under the guidance of an ENT doctor, and pathology examination is needed if necessary to clarify the specific cause and standardize the treatment.