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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.
Stomach cancer is usually not discovered until it becomes more advanced when it causes symptoms. Symptoms of stomach cancer include: 1  Pain in the abdomen. 2  Indigestion and loss of appetite. 3  Nausea and vomiting. 4  Fatigue. 5  Losing weight without dieting. 6  Feeling full or bloated after a small meal. 7  Abdominal swelling. 8  Vomiting blood or having blood in the stool.