9 common signs of colon cancer that are mostly ignored

ET Online

Aug 6, 2025

Persistent changes in bowel habits

Frequent constipation, diarrhea, or narrow stools that last more than a few days may signal something serious.

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Blood in the stool

Bright red or dark blood in stools is a common early sign of colon cancer that’s often dismissed as piles.

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Unexplained weight loss

Losing weight without diet or exercise changes could be a sign your body is fighting an internal issue like colon cancer.

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Ongoing abdominal discomfort

Cramping, bloating, or pain in your lower stomach that doesn’t go away should be checked by a doctor.

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Constant fatigue or weakness

Cancer can cause internal bleeding, leading to iron-deficiency anemia and extreme tiredness, even after rest.

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Feeling that you can’t empty your bowels

If you feel like your bowel isn't completely empty after a movement, it may be due to a blockage or tumor.

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Changes in stool consistency or color

Very dark, tarry, or pencil-thin stools could signal bleeding or obstruction in the colon.

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Frequent gas or fullness

Gas and bloating that linger, especially when not linked to food, might be a red flag for colon trouble.

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Family history & age risk

If you’re over 45 or have a family history of colon cancer, even mild symptoms must be taken seriously.

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