High CEA doesn't mean cancer always....in some infections also it could be high...but it's better to be cautious. So get upper GI scopy plus colonoscopy done as you have mentioned gastric problems.

Upper GI endoscopy to directly visualize the stomach This will help determine the exact cause of your gastric symptoms and CEA elevation3 The mild CEA elevation you have is more likely related to underlying gastric inflammation rather than cancer. The endoscopy will help confirm this. Many people with similar CEA levels are found to have benign conditions after proper evaluation Remember that CEA is just a screening test and not diagnostic of cancer by itself. Stay positive while completing the recommended evaluation with your gastroenterologist.