[header] How to check your health by poop or stool colors [title] Check for red or black stools. [step] These could both potentially be a sign of something going wrong in your digestive system. Both black and bright red stool could be an indicator of bleeding somewhere in the intestines, or from something more minor like hemorrhoids. 
[substeps] Bleeding from the small intestines usually produces melena, or black, tarry stools. Bleeding that originates in lower gastrointestinal tract (such as bleeding from hemorrhoids) usually results in bright red blood.