Is foul smelling stool from colon cancer?

Probably not, but... There can be many reasons for changes in the odor of stool. Diet and medications are just a few. If there is a change that seems to persist for longer than a week or two, see your doctor for a discussion.
Not necessarily. There are many causes of foul smelling stool, e.g., fat malabsorption, c. Difficile infection, certain foods that bring undigested material to colon, e.g. Bean; overeating in general. Vast majority of the time this symptoms is not related to colon cancer.

Related Questions

How can we find colon cancer through stool test?

Colon cancer. Good wikipedia question. Look for blood when you poo. Test poo for blood and can test for cancer cells in stool with DNA testing. Read more...

Black and red dots in stool. Could it be colon cancer?

See a doctor. Without seeing what you are describing it is very hard to know what you have. Diet is the most common cause for the color of bowel movements. Any changes in the bowel function or bowel habits should be evaluated by your doctor. Read more...

Which stage of colon cancer involves blood in the stool?

Bleeding is not. One of staging criteria for colon cancer. Blood in stool is a relatively advanced sign of colon cancer, as is pain. You need a colonoscopy for early diagnosis of colon cancer. Read more...
Bright. Blood in stool tends to come from rectum or anus, and it draws attention. One cannot stage by production of blood. The stage is determined by penetration through the gut wall, and whether nodes, or distant sites are involved. Read more...