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Abdominal cancer occurs when old or damaged cells divide and multiply uncontrollably. The underlying cause of this varies depending on the specific form of cancer. For example: Colorectal cancer commonly develops from adenomatous intestinal polyps in the colon that are not removed while still benign.
Early-stage stomach cancer rarely causes symptoms. This is one of the reasons stomach cancer is so hard to detect early. The signs and symptoms of stomach cancer can include: 1  Poor appetite. 2  Weight loss (without trying) 3  Abdominal (belly) pain. 4  Vague discomfort in the abdomen, usually above the navel. 5  A sense of fullness in the upper abdomen after eating a small meal. 6  Heartburn or indigestion. 7  Nausea. 8  Vomiting, with or without blood.