If there are symptoms, the following may indicate colon cancer: 1  Abdominal pain and tenderness in the lower abdomen. 2  Blood in the stool. 3  Diarrhea, constipation, or other change in bowel habits. 4  Narrow stools. 5  Weight loss with no known reason.
Diarrhea may be caused by: lactose intolerance. bacterial infection. damage to intestinal wall. hormone-producing tumors (including certain types of pancreatic neuroendocrine tumors) inflammation or ulceration of the bowel. malabsorption caused by surgery that has shortened the intestines. pancreatic enzyme insufficiency.
Below are 10 foods that cause diarrhea. 1  Milk is one of the foods that cause diarrhea especially in lactose intolerant individuals. 2  Hot peppers are another one of the foods that cause diarrhea. 3  Artificial fat also known as Olestra is also a food that causes diarrhea. 4  Sugar substitutes are another item found in foods that cause diarrhea.