In many cases, stomach cancer in its early stages does not cause any symptoms, but when it does, they may include: • Poor appetite • Unexplained weight loss • Abdominal (stomach) pain • Vague discomfort in the abdomen • Feeling full after eating a small meal • Heartburn or indigestion • Nausea • Vomiting, with or without blood • Swelling or edema in the abdomen • Blood in the stool • Feeling tired or weak • Yellowing of the skin and eyes (jaundice)