CEA is carcinoembryonic antigen, which is the name of a tumor marker in the organism. Elevated CEA alone cannot predict where the tumor is located, so sometimes other indicators, such as lung indicators, intestinal indicators, and gynecological indicators, are also checked to further clarify where it is. Clinically, if CEA is progressively and significantly elevated, most of them predict the possibility of tumor growth in the body. However, clinically, we can see some patients with high CEA who have had gastroscopy and lung CT done, but no specific site is found and the patient is generally in good condition. So sometimes, there may be some laboratory problems or other factors affecting the patient, so follow-up is more critical. In summary, high CEA is a bad factor and must be monitored dynamically. If the change is not too big at a more balanced level, the impact is not significant, but if it is really getting higher and higher be alert, clarify the site and do some related tests. This includes gastroscopy, pelvic ultrasound, and chest CT.