Temporary changes in stool color from the usual brown most often do not indicate a serious medical problem. But certain color changes may require medical attention, especially if you have other symptoms. Nobody likes to talk about this. The color of your stool matters because it leaves behind clues on your digestive health. When digestion is working well, bile flows properly, fats are absorbed, Understanding Poop Color Meaning: Gut Health from Your Stool GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often, Solved A patient with sudden, excruciating abdominal pain, Chegg.com