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Why does stool testing find colorectal cancer?

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The earliest sign of colon cancer may be bleeding. Often, tumors bleed only small amounts intermittently, and evidence of the blood is found only during chemical testing of the stool. This is called occult bleeding, meaning it is not always visible to the naked eye. When tumors have grown to a large size they may cause a change in the frequency or the caliber of the stool.

From: Colorectal Cancer WebMD Medical Reference

SOURCES: The Cleveland Clinic Department of Gastroenterology and Hepatology. American Cancer Society. The Centers for Disease Control. American Association of Family Physicians. National Institutes of Health. U.S. Preventive Services Task Force.

Reviewed by Minesh Khatri on October 23, 2017

SOURCES: The Cleveland Clinic Department of Gastroenterology and Hepatology. American Cancer Society. The Centers for Disease Control. American Association of Family Physicians. National Institutes of Health. U.S. Preventive Services Task Force.

Reviewed by Minesh Khatri on October 23, 2017

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