Most of the tumor markers can return to normal in about 1 month if the tumor is completely removed after gastric cancer surgery. The presence of increased tumor indicators in gastric cancer often suggests that the tumor load is relatively large, which is relatively common in the middle and late stages. After surgical resection of the lesion, patients’ tumor markers will decrease dramatically and can even be reduced to normal. If all the tumors are completely removed, the tumor indicators can be reduced to normal, and most of them take about 1 month. If the indicators do not drop to normal after surgery, or if there is an increase in the indicators, it is considered that there are still residual tumor cells, and it is necessary to further assist other treatments to improve the prognosis.