Yellow narrow stool, but not always narrow with a lot of mucus and sometimes blood. is this colon cancer?

Bowel caliber/color: Any change in the caliber or color of stool should be evaluated with colonocscopy.

See your Doctor: The color of stool is usually dictated by the liver. Caliber of the stool is a lower colorectal issue. The mucous and blood can be from the colon and needs evaluation by a gastroenterologist as soon as possible.

See a doctor: You need evalv by your pcp/gastroenterologist to dig further deep into your symptoms and associated signs like lymph nodes, wt loss. Loss of appetite, icterus etc, . Depending on your age the most likely disease causing these symptoms varies. For sure these symptoms of concerning for cancer. See a doctor soon.