Blood sampling for tumor markers can usually detect cancer. Clinical tumor markers can be divided into the following categories: tumor embryonic antigens, such as CEA, AFP; ectopic hormones, such as HCG; enzymes and isoenzymes, such as LDH, PAP; plasma proteins, such as β22M; and tumor antigens, such as CA19-9, CA125. In addition to the major clinical tumor markers, there are also a number of common markers, which are important for the diagnosis of certain types of tumors. In addition to the main clinical tumor markers, there are some common markers which are important for the diagnosis of certain types of tumors. The main defects of current tumor markers are: the specificity and sensitivity are not high enough, and there is the possibility of misdiagnosis or missed diagnosis; the specific markers of certain tumors are still unclear, and it is difficult to identify them in the clinic. If you are not feeling well, you should go to the hospital immediately for examination without delay, so as not to cause delay in the disease.