The medical term tumor markers is a collective term for a class of substances produced or secreted by tumor cells in the process of growth and proliferation, specifically including some tumor-specific antigens, hormones, receptors, enzymes, oncogenes and more than 40 kinds of substances. These substances exist in blood, cells and other body fluids, and if they reach a certain amount, they can be detected quantitatively by using biochemical, immunochemical or radioimmune techniques. Because of the sensitivity and ease of detection, tumor marker test has become a routine medical examination. Of course, elevated tumor markers do not necessarily mean that one is suffering from cancer, but the significance of its screening is to suggest the role. Elevated tumor markers can also be seen in non-tumor diseases, such as chronic hepatitis, prostate enlargement, endometriosis and taking certain drugs, which may interfere with the test results. If a certain index is mildly elevated in one test result, it is not necessary to be overly nervous, but you can go to a specialist hospital for analysis to exclude factors potentially affecting the test result and recheck again one or two months after the test. If the dynamic test result of tumor marker is still elevated, it indicates that there may be abnormality, which needs to be confirmed by ultrasound, CT, PET/CT, etc. If necessary, pathological biopsy can be used to clarify the diagnosis. In view of the current high incidence of tumor, it is suggested that we may check the tumor markers during the physical examination.