Tumor markers of colon cancer are mainly carcinoembryonic antigen and glycan antigen. 1. Carcinoembryonic antigen: continuous monitoring of carcinoembryonic antigen level can be used to observe the efficacy of tumor treatment and judge the prognosis, and it is mainly used in the clinical monitoring of colorectal, gastric, pancreatic, lung, breast and medullary thyroid cancers. 2. Glycoantigen: mild elevation can be seen in inflammation of digestive tract; obvious elevation can help diagnose pancreatic cancer, colorectal cancer and rectal cancer, and obvious elevation can be seen in digestive tract tumors. Patients suspected of having colon cancer should do colon cancer tumor marker test as well as other related tests, such as pathological analysis, ultrasound, colonoscopy and other related tests. People with abnormal colon cancer tumor markers need to actively seek medical treatment, and patients should not use medication on their own to avoid adverse results.