Serum thymidine kinase tk1 measurement is high if it is mildly elevated caused by inflammation and infection, usually without special treatment, if it is caused by tumor cell proliferation, it can be combined with other symptoms as well as examination to clarify the diagnosis. Thymidine kinase tk1 is related to cell proliferation and is elevated during cell division. High serum thymidine kinase tk1 measurement suggests that there may be abnormal cell proliferation, which may be caused by acute and chronic inflammation, or the presence of malignant tumors such as intestinal cancer and esophageal cancer. If the infection is caused by inflammation, thymidine kinase will only be mildly elevated, usually not more than 4pm, and can be lowered after the inflammation subsides, without special treatment. If it is obviously high, there may be tumor cell proliferation, and pathological examination can be conducted, combined with other symptoms to clarify the diagnosis. The result of this test can not directly tell the reason, should be under the guidance of the doctor combined with other symptoms and examination, clear diagnosis, and reasonable treatment.