Tumor markers are a class of substances that are synthesized or released by tumor cells or produced by the body in response to tumor cells during the process of tumorigenesis and proliferation. When a tumor occurs in the body, certain tumor markers in blood, cells, tissues or body fluids may increase accordingly. Usually, doctors will check different markers according to different tumors. However, most of the tumor markers known today are not only found in malignant tumors, but also in benign tumors, embryonic tissues, and even normal tissues. Therefore, the specificity of certain tumor markers is relatively poor, that is, the rate of false positives and false negatives is relatively high. Thus, it can be seen that the diagnosis of tumor cannot rely on the examination of tumor markers alone, and only continuous observation of the dynamic changes of tumor markers can be used as the basis for judgment. If physical examination reveals that one or several tumor markers are continuously elevated, then vigilance should be raised and further CT, ultrasound and other methods of examination are needed. Especially, pathological examination is required to make a clear diagnosis. If there is only a single mild elevation or no major change in the results of each examination, there is no need to be so nervous. In addition, there can be different tumor markers for different diseases and different patients as indicators for their efficacy monitoring. When the tumor has improved with treatment or the condition worsens due to tumor recurrence and metastasis, the change of these tumor marker levels can be used as a reference. In summary, various tumor markers can only be used as one of the auxiliary diagnostic indicators. Before a clear pathological histological diagnosis is made, one should not be sure that one is suffering from cancer just because one indicator is mildly elevated, or even carry out anti-tumor treatment to avoid unnecessary harm and loss, but should be vigilant and further examine and observe AFP elevation: 1. About 71% of patients have AFP>500ug/L. 2. Patients with viral hepatitis and liver cirrhosis have different degrees of elevated AFP.