Nasopharyngoscopy is a routine examination in otolaryngology, in which the nasopharyngoscope penetrates deep into the nasal tract, thus providing a careful and comprehensive examination of the entire nasal cavity, sinus opening area, and nasopharynx for disease detection and diagnosis. Nasopharyngoscopy includes indirect nasopharyngoscopy and direct nasopharyngoscopy, and direct nasopharyngoscopy includes fiberoptic nasopharyngoscopy, electronic nasopharyngoscopy and nasal endoscopy. At present, electronic nasopharyngoscopy is mostly used, and in most cases, electronic nasopharyngoscopy and electronic laryngoscopy have been combined into one, which can examine both the nasopharynx and the larynx. Nasopharyngoscopy allows observation of the degree of adenoid hypertrophy, posterior nostril obstruction, and the degree of pressure on the eustachian tube bulge. The posterior part of the nasal cavity is also observed to see if there is a combination of chronic sinusitis. Nasopharyngoscopy can also look at the condition of the nasal mucosa, such as the presence of nasal neoplasia and nasal tract polyps, and help find the bleeding point of nasal bleeding. For adults with recurrent blood in the snot and nasal regurgitation, it can check for pharyngeal sac formation and chronic nasopharyngitis. In adults with recurrent unilateral secretory otitis media, nasopharyngoscopy can check for lesions in the pharyngeal opening of the eustachian tube, blockage and scar formation, and initially exclude the possibility of nasopharyngeal cancer and nasopharyngeal lymphoma, etc. In children, nasopharyngoscopy can exclude the presence of foreign bodies in the nasal cavity.