Blood in stool may result from bleeding in the upper or lower GI tract — and the color of the blood can help indicate its source. Black, tarry stool Black, tarry stool may point to a bleed in ...

A poop color chart can help narrow the possible causes based on colors ranging from white, yellow, and orange to red, green, and black. Based on the initial findings, gastroenterologists can order ...

Black stools can also be formed by blood in your upper GI tract (mouth to duodenum), which is digested and blackened as it moves through your intestines. Black stools should always be investigated, ...

Black poop can have harmless causes, like eating dark foods or taking medications that make your stool look darker. But it can also be a sign of melena, which means there's blood in your stool.

Recent research reveals fascinating links between gut bacteria and stool characteristics. These microscopic organisms influence everything from color to consistency. Dietary influences ...

Consuming more of these foods than usual may change the color of your stool. Ultra-processed foods with added colors, like black licorice, may also change your stool and digestive fluid color.