what causes black stools in humans
-When blood supply is cut off to part of the intestines. -Inflammation of the stomach lining (gastritis). -Trauma or foreign body. -Widened, overgrown veins in the esophagus and stomach. Eating black licorice, lead, iron pills, bismuth medicines like Pepto-Bismol, or blueberries can also cause black stools. Call your doctor right away if you notice blood or changes in the color of your stool, NIH advises. In children, a small amount of blood in the stool is usually not serious.