Carcinoembryonic antigen 5.20 last month and 5.26 this month doesn’t matter, it may be caused by too much fatigue in a short period of time, infection or inflammation in the body, etc. It may also be caused by the growth of tumor, which can be further judged by the examination of tumor markers. 1. Tumor growth: carcinoembryonic antigen belongs to tumor non-specific indicators, which is a glycoprotein with antigen specificity secreted by tumor cells. If there is growth or out of normal range, it is necessary to consider the possible presence of malignant tumors in the body. The presence of malignant tumor growth can be quickly diagnosed by endoscopy, pathology section or examination of the growth site. 2. Benign lesions: Cirrhosis of the liver, rectal polyps, ulcerative colitis, or breast disease can also cause a small increase in the amount of carcinoembryonic antigen in the body, resulting in false positives or abnormally high levels. Early prevention can be achieved by regular general check-ups and monitoring of the carcinoembryonic antigen level. In the case of abnormal tumor growth or elevated carcinoembryonic antigen, regular medical checkups and prompt medical attention are sufficient.