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    What causes black tarry stool?

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Posted on Sat, 13 May 2017 in Digestion and Bowels
Question: I am undergoing treatment for vitamin deficiencies of B12 and D. I have had a recent colonoscopy that was clean. Tissues taken for biopsy were benign. Today, I had a thick, tarry black stool. Can that be coming from the vitamin deficiencies?Will it be ok to wait until Monday to see a medical professional about the bloody stool?
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Answered by Dr. Grzegorz Stanko 27 minutes later
Brief Answer:
You should not wait for it.

Detailed Answer:
Hello.

Thank you for the query.

The black tarry stool is a sign of stomach or small intestine bleeding. As you have also B12 deficiency, stomach inflammation or even a tumor is possible.

You should not wait for it. ER visit is advisable. Gastroscopy should be done as soon as possible.

Hope this helps. Let me know if I can assist you further.

Regards.


Above answer was peer-reviewed by : Dr. Arnab Banerjee
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Answered by
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Dr. Grzegorz Stanko

General Surgeon

Practicing since :2008

Answered : 5768 Questions

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