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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.
Occult blood in the stool has many of the same causes as rectal bleeding, and may be associated with the same symptoms as more active bleeding. For example, slow bleeding from ulcers, colon polyps, or cancers can cause small amounts of blood to mix and be lost within the stool.