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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.
Sometimes, the blood may not even be visible on the stool, and this is termed occult gastrointestinal bleeding. By far, the most common causes of visible blood in the stools are diverticulitis and hemorrhoids. Other conditions and situations that can cause blood in the stools include: colon cancer. non-cancerous growths, such as polyps. intestinal infections (bacterial enterocolitis) that can be caused by foodborne pathogens, such as salmonella and E. coli.