Doctors Reveal the Terrifying Signs That Colon Cancer Might Already Be Attacking Your Body

Changes in Stool Shape

When your stool consistently appears narrower than usual—sometimes described as pencil-thin—it may suggest something is partially blocking your colon. While occasional variations are typically harmless, persistent changes deserve medical attention. This narrowing occurs when growths or obstructions restrict the pathway through your intestinal tract, preventing waste from passing normally.

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Blood in the stool

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Blood in the stool (rectal bleeding) can be a sign of colon (colorectal) cancer because a bleeding tumor or polyp in the colon or rectum can leak blood into the bowel, sometimes turning the stool bright red or, if the bleeding is higher up, making it look darker. At the same time, blood in stool is not specific to cancer and is often caused by more common problems such as hemorrhoids or other benign conditions. Because colorectal cancer and polyps don’t always cause symptoms early on, any persistent, recurrent, or unexplained bleeding—especially if it comes with a change in bowel habits, belly pain, fatigue, or weight loss—should be checked by a clinician to find the cause and rule out colorectal cancer.

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