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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.
1 If the tumor gets large enough, it may completely or partially block your colon. 2  Abdominal distension: Your belly sticks out more than it did before without weight gain.  Abdominal pain: This is rare in colon cancer. One cause is tearing (perforation) of the bowel.