Squamous cell carcinoma-associated antigen is one of the tumor markers, and a significant increase in it often indicates the presence of a tumor in the body. However, the sensitivity of tumor markers is high but the specificity is not very high, so its elevation may not necessarily mean tumor, sometimes it may also be significantly elevated when there is inflammatory evidence in the body. Therefore, it should be combined with imaging examinations, such as chest CT and abdominal CT, to see if there are any suspicious occupying lesions. In addition, if this tumor marker is mildly elevated, it needs to be reviewed regularly, and most of them can be normalized.