Blood in stool: Also known as hematochezia, which can be bright red if the tumor is near the rectum or dark red or maroon if higher up in the colon Tenesmus: Which can occur as colon cancer progresses due to the persistent and increasing inflammation
Black, tarry stools: Also known as melena, more often seen with right-sided cancer as hemoglobin in the blood gradually darkens during its long passage toward the rectum 7 Unexplained weight loss: A common consequence of advanced cancer in which systemic inflammation triggers muscle and weight loss as well as the loss of appetite 8
A change in bowel habits, such as diarrhea, constipation, or narrowing of the stool, that lasts for more than a few days A feeling that you need to have a bowel movement that’s not relieved by having one Colorectal cancers can often bleed into the digestive tract.
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