There are many types of cancer, and the etiology of cancer is a common problem throughout the world, and the pathogenesis is not fully understood. Some malignancies may have major causative factors that are relatively clear from clinical studies, such as cervical cancer, which is mainly associated with human papillomavirus infection, or HPV infection. Therefore, the HPV vaccine, also known as the cervical vaccine, is now effective in preventing cervical cancer. In addition, because nasopharyngeal cancer has regional and familial aggregation phenomenon, it is related to EBV infection, for example, Guangdong Province is the province with higher incidence rate, and radiation therapy is generally used. And stomach cancer may be related to diet and H. pylori infection. Long-term smoking or excessive consumption of barbecued or smoked food may lead to various cancers, especially stomach cancer and lung cancer.