What is bowel cancer and what causes it?

Cancer. Cancer is an overgrowth of abnormal cells, and can occur most anywhere in the body. Intestinal cancer can more commonly affect the large intestine or colon, but also stomach or small bowel less commonly. It is an adenocarcinoma. Causes are uncertain and can be genetic, eating fatty foods, not eating healthy fruits and vegetables, obesity, lack of exercise, smoking, etc.