The fact that all 12 tumor markers are normal does not necessarily mean that you are fine, it just means that the risk of a tumor is relatively low. The 12 tumor markers are only used for screening of tumors, and may not show abnormalities in some patients with early stage tumors, so they cannot be used as the basis for diagnosis alone. Therefore, it cannot be used as a diagnostic basis alone. In other words, a normal tumor marker 12 alone cannot completely rule out the possibility of having a tumor. It is recommended that if there is a family history of tumor, or if there are uncomfortable symptoms, one should pay attention to regular review of tumor marker levels, and improve CT and other imaging examinations as soon as possible, as well as pathological examinations to clarify whether there is a tumor or not. To sum up, it is recommended not to take it lightly, and if necessary, consult a doctor in time for standardized diagnosis and treatment.