Carcinoembryonic antigen may or may not be elevated in early stage colon cancer patients. 1. Carcinoembryonic antigen is a broad-spectrum tumor marker, which can reflect the presence of many kinds of tumors, such as colorectal cancer, gastric cancer, breast cancer, etc. However, its specificity is not strong enough and its sensitivity is not high enough, so in the early stage of colon cancer, the value of carcinoembryonic antigen may be abnormally high or within normal range, which is not very obvious in the early diagnosis of the disease. 2. For patients with suspected early stage of colon cancer, carcinoembryonic antigen can be monitored continuously, and if it is found that its value increases exponentially within a short period of time, it suggests that malignant tumors are more likely. It is recommended to carry out pathological examination as soon as possible to clarify the diagnosis and determine the direction of treatment. 3. For patients with early stage colon cancer, it is recommended to seek professional physician’s treatment as soon as possible for surgical treatment or radiotherapy or chemotherapy to avoid delaying the condition.