Through blood tests, in fact, a variety of diseases can now be detected, and the most common problems in physical examinations are as follows: 1. 1+X tests, liver function, kidney function, blood sugar, blood lipids, blood uric acid, all of which can be detected through blood analysis; 2. commonly used tumor markers, such as tumor markers for lung cancer, liver cancer, intestinal cancer, and breast cancer can also be examined through blood; 3. stomach function, including pepsinogen and gastrin17, which can also be examined through blood; 4. Viral antibodies, such as EBV antibodies, can be checked, and the level of this antibody is related to EBV infection, which in turn is related to the occurrence of nasopharyngeal cancer.