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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.
Important but uncommon causes of abdominal bloating include. 1  large intra-abdominal tumors, such as those arising from cancers of the ovarian, liver, uterus and stomach. 2  megacolon, an abnormal dilation of the colon caused by some diseases, such as Chagas disease, a parasitic infection.