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Have had Acute Renal Failure.
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Hello. Thank you for posting.
Bleeding in the upper portion of your digestive system can cause black, tarry stools. Ulcers or another form of irritation in your esophagus or stomach known as gastritis can cause bleeding. When the blood mixes with digestive fluids, it takes on the appearance of tar. Any drastic change in stool color, such as you describe, should be reported to your doctor.
Helena
February 3, 2018 - 3:01pmThis Comment