Unofficial: pathology - Definition :malena is the passage of black tarry stool due to the presence of altered of blood. Couses of malena: 1 hookworm 2 ulcer -peptic ,typhoid, | Facebook
What are potential causes of black stools? - Quora
Invisible Blood in Stool Linked to Various Diseases | GI Associates
Black Poop In Babies: Is It Normal, Causes And When To worry