In some cases, like colorectal cancer ... people can take screening tests that look for blood in the stool that’s not visible ...

Like anal fissures ... when they're sitting inside the digestive tract. This blood might also make your stool look darker than usual. Constipation is the most common cause of bloody diarrhea ...

Colorectal cancer can seem a lot like some common gastrointestinal ... and make your stool look bloody or black. You could also see blood in the toilet or on tissue if you have hemorrhoids ...

If you’ve taken bismuth medication like Pepto Bismol, that can also make your stools look almost black. It’s always best to check with a doctor if you’re unsure. Bright red blood in your stools If you ...

New blood tests for detecting colorectal cancer seem like an easy and convenient option compared to a colonoscopy. Instead of ...

tar-like stool. Without treatment, bleeding in the digestive tract can lower a person’s red blood cell count and lead to anemia. Doctors can treat constipation with prescription stool softeners ...