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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.
The exact cause of stomach tumors is not really known yet. A malignant stomach tumor can affect the other organs around the stomach like the pancreas, the esophagus, the lymph nodes and the intestines. A malignant stomach tumor can also protrude into and affect the liver and lungs.