Nasopharyngeal cancer is one of the common malignant tumors in China, and it is the top malignant tumor in otolaryngology. The high incidence of nasopharyngeal cancer in China ranks first in the world, accounting for 80% of the world total. The incidence rate of men is two to three times that of women, with a high incidence in middle age. Its true etiology is still unclear and may be related to heritage, viral infection, and environmental factors. The American Association for the Advancement of Science has suggested that salted fish and nasopharyngeal cancer have a strong relationship, and frequent consumption of salted fish is prone to nasopharyngeal cancer. Nasopharyngeal cancer grows at the junction of the posterior end of the nasal cavity and the superior end of the pharynx. It is often misdiagnosed because its growth site is hidden and not easily detected, and its early clinical manifestations have many peculiarities. Generally speaking, nasopharyngeal carcinoma has a tendency to bleed easily in the early stage, often appearing as morning retracted snot with blood, or blowing bleeding snot, but the amount is small and will stop naturally, so it is easy to be ignored. In addition, tumor obstruction or compression of the eustachian tube may cause tinnitus, ear stuffiness and stuffy feeling on that side, which is easily misdiagnosed as simple secretory otitis media in clinical practice. Therefore, if the air is closed in one ear for more than one week, it is necessary to check the nasopharynx. Another important clinical feature of nasopharyngeal cancer is the metastasis to the lymph nodes in the neck at an early stage. Metastatic masses in the neck are the first symptom in 60% of cases. In other words, many patients do not have other symptoms, but discover painless lumps in the upper part of the neck unintentionally, and some patients are even treated in the primary hospital, and the lymph nodes in the neck are removed and examined for metastatic squamous carcinoma, and then the primary lesion is found, which delays the early treatment. More than 90% of patients with early stage nasopharyngeal cancer can be cured, but unfortunately, more than 70% of patients are already in the middle or late stage when they come to the hospital for examination. On the whole, nasopharyngeal cancer is sensitive to radiotherapy, and some patients who are not sensitive to radiotherapy can be treated surgically. The 5-year survival rate after radiotherapy is about 50%. Therefore, if there is blood in the aspirated snot, closed air in one ear, or painless mass in the upper neck, you should go to the otolaryngology department for nasopharyngeal examination as soon as possible to exclude nasopharyngeal cancer.