Normal CEA and ca199 cannot exclude gastric cancer, but a small number of gastric cancer patients can have normal CEA and CA199. Ca199 is a tumor marker, which can be elevated in pancreatic cancer, gastric cancer, colon cancer, rectal cancer, etc. CEA is also one of the tumor markers, which can be elevated in gastric cancer, colon cancer, rectal cancer, pancreatic cancer, etc. In a way, the elevation of CEA and ca199 at the same time can not exclude gastric cancer. To a certain extent, patients with elevated CEA and ca199 are more likely to suffer from gastric cancer, but the values of CEA and ca199 can be normal in some gastric cancer patients, which can only be diagnosed through gastroscopy, pathological biopsy, etc. If the patients have relevant symptoms, it is recommended to go to the hospital in time to improve the relevant examination.