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The most common bacterium linked to digestive tract infections is helicobacter pylori. Esophageal tears â Tears in the esophagus can cause blood loss that makes its way out through stool. Polyps â Abnormal benign growths in the digestive tract called polyps may bleed and cause blood in stools. Cancer â Malignant tumors in the digestive tract or colon can also cause bleeding. This is harder to diagnose as the blood in stool is usually in very little amounts and is hardly noticeable to the naked eye.
Colon polyps often cause no symptoms. You might not know you have a polyp until your doctor finds it during an examination of your bowel. But some people with colon polyps experience: 1  Rectal bleeding. 2  This can be a sign of colon polyps or cancer or other conditions, such as hemorrhoids or minor tears in your anus.3  Change in stool color. Rectal bleeding. 2  This can be a sign of colon polyps or cancer or other conditions, such as hemorrhoids or minor tears in your anus. 3  Change in stool color. 4  Blood can show up as red streaks in your stool or make stool appear black. 5  A change in color may also be caused by foods, medications and supplements.