The causes of non-keratinizing nasopharyngeal carcinoma are the same as those of other tumors, which are not yet completely clear. The endogenous factor is genetic susceptibility, which has certain hereditary factors, and there are clinical reports of identical twins and twins suffering from nasopharyngeal carcinoma at the same time. External factors include the following: 1. EBV infection: just like liver cancer is hepatitis B virus infection, it is a high-risk causative factor; 2. Environmental factors: including large environment and small environment, large environment includes atmospheric pollution, formaldehyde exposure, chemical gas, atmospheric dust, etc., which are high-risk causative factors. Residents in areas with high incidence of nasopharyngeal cancer have the habit of eating pickled products because these foods contain more nitrite, which is a class 1 carcinogen, and rice and living water have higher content of metal nickel, which is also a carcinogenic factor of nasopharyngeal cancer. Therefore, we must eat less pickled foods and foods with excessive metal content in our diet to avoid the occurrence of nasopharyngeal cancer.