Carcinoembryonic antigen (CEA) negativity does not necessarily mean that you do not have cancer. Carcinoembryonic antigen is only an indicator to assist in the judgment of tumor, we cannot rely solely on one indicator to judge whether we have cancer or not, we need to combine with other test results to make a comprehensive judgment. Carcinoembryonic antigen is correlated with cell proliferation and differentiation, which is reflected in many kinds of malignant tumors, mainly seen in digestive malignant tumors, the probability of malignant lesions will be reduced through the examination of the corresponding negative indicators, but it can’t completely exclude the possibility of cancer. Some malignant tumors originating from the head, neck, face and cranial brain may show negative indicators. Clinical need to integrate a variety of tumor markers, but also combined with imaging, laboratory tests and pathological biopsy, etc., to carry out a comprehensive diagnosis, and ultimately determine the specific lesions. If you suspect that you have a tumor, please consult the hospital in time and take active diagnosis and treatment to avoid delaying your condition.