You have black stools but the rectal examine showed no blood what could it be?

* Medications: Bismuth subsalicylate (Pepto-Bismol), activated charcoal, and iron sulfate can all cause black stools.

* Foods: Licorice, blueberries, blackberries, and beets can all cause black stools.

* Digestive problems: Inflammatory bowel disease (IBD), celiac disease, and diverticulitis can all cause black stools.

* Internal bleeding: Bleeding from the upper GI tract, such as from a stomach ulcer or esophageal varices, can cause black stools. However, this type of bleeding would typically be accompanied by other symptoms, such as abdominal pain, nausea, and vomiting.

* Melena: Melena is a condition characterized by black, tarry stools. It is caused by bleeding from the upper GI tract that has slowed down or stopped. Melena is a serious condition that requires medical attention.

* Rare conditions: Some rare conditions, such as lead poisoning and Addison's disease, can also cause black stools.