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What Causes Black Tarry Stools?

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Posted on Sat, 19 Mar 2016
Question: passing black tarry stool

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Answered by Dr. Bonnie Berger-Durnbaugh (57 minutes later)
Brief Answer:
Most likely there is bleeding from upper GI tract.

Detailed Answer:
Hello and welcome,

Black tarry stools usually means that there is bleeding in the upper gastrointestinal tract - the esophagus or stomach - and it's usually the stomach. The acid in the stomach changes the blood to this appearance.

If you have a gastoenterologist, you should call him or her tonight (or his/her call group) to report this symptom. You should also go to an urgent care clinic or ER where they can examine you and check a CBC to see if you are losing a lot of blood.

Some medications can give the stool a black appearance, such as Pepto Bismol, but not a tarry appearance.

Note: For further follow up on digestive issues share your reports here and Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Bonnie Berger-Durnbaugh

General & Family Physician

Practicing since :1991

Answered : 3133 Questions

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What Causes Black Tarry Stools?

Brief Answer: Most likely there is bleeding from upper GI tract. Detailed Answer: Hello and welcome, Black tarry stools usually means that there is bleeding in the upper gastrointestinal tract - the esophagus or stomach - and it's usually the stomach. The acid in the stomach changes the blood to this appearance. If you have a gastoenterologist, you should call him or her tonight (or his/her call group) to report this symptom. You should also go to an urgent care clinic or ER where they can examine you and check a CBC to see if you are losing a lot of blood. Some medications can give the stool a black appearance, such as Pepto Bismol, but not a tarry appearance.