Why is my diarrhea black?
Ethan Hayes
Published Jan 23, 2026
Black or tarry stools with a foul smell are a sign of a problem in the upper digestive tract. It most often indicates that there is bleeding in the stomach, small intestine, or right side of the colon. The term melena is used to describe this finding.
tarry stools
Melena or melaena refers to the dark black, tarry feces that are associated with upper gastrointestinal bleeding. The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria. Melena.
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What does it mean when your diarrhea is black?
Black, tarry diarrhea is often caused by bleeding in the esophagus, stomach or small intestine. Another common cause for black, tarry stool could be a bleeding ulcer in the stomach, or inflammation of your stomach lining (AKA, gastritis).Is black diarrhea serious?
Bleeding in the gastrointestinal tract, such as in the stomach or intestines, can make the stool appear black. The higher up in the digestive system the bleeding occurs, the darker the blood tends to be. A person should see their doctor if they experience the following symptoms: black, tarry stools.What illnesses cause black diarrhea?
Why Is Your Poop Black and Tarry?
- Iron Supplements.
- Dark-Colored Foods.
- Medicines With Bismuth.
- Bleeding Ulcer.
- Esophageal and Gastric Cancers.
- Mallory-Weiss Tear.
- Esophageal Varices.
How do you fix black diarrhea?
What are the treatment options for black stools?
- proton pump inhibitors (PPIs), which reduce the amount of acid in your stomach so the ulcers can heal.
- H2 receptor antagonists, which also reduce the amount of acid in the stomach.
- over-the-counter antacids.
- reduced use of nonsteroidal anti-inflammatory drugs (NSAIDs)