What does blood in stool look like?

You might see blood mixed with stool or blood at the end of passage of stool and even dark or black stools. Bright red blood usually indicates bleeding that's low in either colon, rectum or anus. Dark red or maroon blood indicates bleeding that's higher in the colon or small intestine. Dark stools indicate that bleeding from stomach most probably an ulcer. Sometimes, you may observe loose stools mixed with streaks of blood which is seen in infections like dysentry.