Stomach cancer is different from other cancers that can occur in the abdomen, like cancer of the colon or rectum (large intestine), liver, pancreas, or small intestine. Stomach cancer is cancer cells starting to grow anywhere inside the stomach or the stomach wall. These cancers can have different symptoms, different outlooks, and different treatments. The most common symptoms of stomach cancer are difficulty swallowing (dysphagia), weight loss, indigestion (dyspepsia) that doesn’t go away, feeling full after eating small amounts, feeling or being sick, and tiredness due to low red blood cells (anemia).