Poop Changes by Cancer Stage
Stage 3: Tumors may cause constipation, diarrhea, alternating patterns, blood in stool, abdominal cramps, or bloating. Iron-deficiency anemia is common.
Stage 4: Advanced cancer often leads to dark, sticky stools (melena), nausea, vomiting, weight loss, or severe obstructions. Symptoms may worsen if cancer spreads to other organs.
Key Takeaways
Small changes in stool, like blood, thinner shape, or frequent diarrhea, can be warning signs of colon cancer. While other conditions may mimic these symptoms, persistent issues should prompt a visit to a healthcare provider. Early detection makes colon cancer far more treatable.

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