When an ulcer bleeds, the blood can pass through the digestive tract and be excreted in the stool. As the blood is digested, it turns black, giving the stool a dark, tarry appearance. This ...

There are also signs that your stomach ulcer has become very serious. These include: dark, tar-like stool sudden very sharp abdominal pain vomiting blood If you experience any of these symptoms ...

If you experience blood in your stool and have a diagnosis of Crohn’s disease, it’s best to talk with your doctor. Chronic inflammation from Crohn’s disease can cause ulcers to develop.