Follow-up care after treatment for stomach cancer is important. Even when there are no longer any signs of cancer, the disease sometimes returns because undetected cancer cells remained somewhere in the body after treatment. Your doctor will monitor your recovery and check for recurrence of the cancer. Checkups help ensure that any changes in your health are noted and treated if needed. Checkups may include a physical exam, lab tests, x-rays, CT scans, endoscopy, or other tests. Between scheduled visits, you should contact the doctor if you have any health problems.