Nasal endoscopy mainly examines the nasal mucosa, secretions, nasal structure and the presence of neoplasm. 1. Nasal mucosa: when using nasal endoscopy, it is generally necessary to determine whether the nasal mucosa is abnormal. Normally, the nasal mucosa is light red, moist and glossy, if the color of the nasal mucosa becomes white or red, it means that there is edema or congestion. 2. Nasal secretion: Secondly, during nasal endoscopy, it is also necessary to observe the secretion, such as mucus secretion, watery secretion, purulent secretion, etc., so as to initially judge the existence of certain diseases in the patient. 3. Nasal cavity structure: including the structure of nasal septum, nasal turbinate, nasal cavity and nasal passage, nasopharyngeal cavity and other parts. The septum structure can be observed to see if there is any deviation; and the inferior turbinate, middle turbinate, and superior turbinate structures can be observed to determine if there is any hypertrophy and hyperplasia. 4. Whether there are new organisms or not: during nasal endoscopy, it can observe whether there are polyps and tumors and other occupying diseases in the nasal cavity; and secondly, when it is used for children’s examination, it can make clear whether there is adenoid hypertrophy in the children. Therefore, for patients who need nasal endoscopy, they should pay attention to reasonable treatment under the guidance of professional doctors.