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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.
In people with cancer, swelling of the stomach or abdominal area can have a few different causes. 1  Fluid may collect in the area of the body containing the abdominal organs. This fluid is called ascites. 2  Sometimes the bowels do not empty well. Stool may build up and gas may cause bloating.