Overview Diet appears to be one risk factor for stomach cancer. People who eat large amounts of smoked foods, salted fish and meat, and pickled vegetables seem to be at higher risk. Understanding Your Diagnosis To make the diagnosis of stomach cancer, your doctor will take down your medical history, give you a physical exam, and order certain tests to rule out other conditions. Deciding on Treatment Your treatment choices depend on how far it has spread, as well as the way in which it grows. You may need surgery, chemotherapy, radiation therapy, or a combination of these.