Colon Cancer: Early Warning Signs That Deserve Medical Attention

Colorectal cancer can develop without noticeable symptoms, especially early on. When symptoms do occur, they can also be caused by hemorrhoids, infections, IBS, or other non-cancerous conditions. Still, persistent or unexplained changes deserve medical attention. (CDC)

🚩 Warning signs to watch for

1. Blood in or on the stool — bright red, dark red, or very dark stools.
2. A persistent change in bowel habits — new constipation, diarrhea, or alternating between the two.
3. A feeling that your bowel doesn’t completely empty.
4. Stools that become unusually narrow or change shape.
5. Persistent abdominal pain, cramps, bloating, or discomfort.
6. Unexplained weight loss.
7. Unusual or persistent fatigue — sometimes related to iron-deficiency anemia from slow blood loss.
8. Unexplained iron-deficiency anemia, particularly in adults without an obvious cause.
9. Persistent changes in appetite or nausea/vomiting. (Cancer.gov)

🩺 Don’t wait for symptoms to get severe

A particularly important point is that early colorectal cancer may cause no symptoms at all. Screening can detect cancer earlier and can sometimes find and remove precancerous polyps before they become cancer. (Cancer.gov)

If you notice rectal bleeding, persistent abdominal pain, a lasting change in bowel habits, unexplained weight loss, or unexplained anemia, arrange a medical evaluation rather than assuming it’s simply aging or hemorrhoids.

Bottom line: These symptoms do not mean you have colon cancer, but persistent or unexplained symptoms should not be ignored. Screening is important even when you feel perfectly well. (CDC)