Nasoscopy may not necessarily be able to detect nasopharyngeal cancer, which usually needs to be determined by tissue biopsy and pathology examination after nasopharyngoscopy. Nasopharyngeal cancer is a common malignant tumor. Some early stage nasopharyngeal cancer patients, due to the inconspicuous protrusion of the lesion or the lack of obvious changes in the mucosa, it is very difficult to detect the lesion simply through nasal microscopy and nasopharyngoscopy, and it is necessary to take pathological biopsy through nasopharyngeal microscopy to make a definite diagnosis. For people with high risk of nasopharyngeal cancer, they should have regular medical checkups and nasopharyngoscopy every year, so as to achieve early screening, early diagnosis and early treatment. They should pay more attention to oral hygiene in daily life, keep the nasal cavity and oral cavity healthy, quit smoking and limit alcohol, and eat more food with high content of dietary fiber and vitamins.