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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.
1 Only a small proportion of polyps cause symptoms or signs. 2  When they do, the symptoms and signs usually are the result of bleeding from the polyp and may include. 3  red blood mixed with stool. 4  red blood on the surface of stools. 5  black stools. 6  weakness. 7  light-headedness, 8  fainting, and. 9  pale skin.