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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Diarrhea After Consuming Blueberries?

I have eaten more than usual blueberries in the last few days and last night I had a stomach ache and went poop the first time more like diarrhea and then later a second time my poop was black. I was scared because I have never had that before. I have not gone today. Is it from the blueberries
posted on Mon, 21 Aug 2017
Twitter Mon, 23 Oct 2017 Answered on
Twitter Tue, 24 Oct 2017 Last reviewed on
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General & Family Physician,  's  Response
Hello,
Eating lots of blueberries can cause cramping and diarrhea but should not cause black stools. They can cause dark blue stools that may be confused with black. Black stools are concerning for blood in the stool and this would not be caused by the blueberries. If you continue to see black stools after the blueberries are out of your system, see a doctor right away.
Regards
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What Causes Diarrhea After Consuming Blueberries?

Hello, Eating lots of blueberries can cause cramping and diarrhea but should not cause black stools. They can cause dark blue stools that may be confused with black. Black stools are concerning for blood in the stool and this would not be caused by the blueberries. If you continue to see black stools after the blueberries are out of your system, see a doctor right away. Regards