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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Dark Stool After Colonoscopy?

Hello Dr, I had endoscopy/colonoscopy on Thursday June first. The day after the procedure I had dark , terry bowl movements. Yesterday I had stomach pain so I took one omeprazole 40mg. And my doctor suggested me to continue miralex so I took one glass of it at night and for my stomach pain I took one Famotidine. Today (3 days after procedure) I had dark stool again. I don t have any other symptoms. I m really concerned. What should I do?
Fri, 30 Jun 2017
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General & Family Physician,  's  Response
Hi,

I understand your concern.

Before running into final conclusions, I'd ask to send the full colonoscopy report to me, so I can analyze the findings and compare with your clinical symptoms.

Sometimes, there is a light bleeding after the colonoscopy procedure, which is clinically expressed with dark stool (due to laceration of colon mucosa).

That will be going in a few days.

Next, you say that your doctor suggested to take Miralax, which is a gentle laxative. This makes me think you are suffering of constipation or hard stool. Miralax will help ease bowel movement (bm).
Hard stool or constipation might cause laceration of colon/anal mucosa ending up with light bleeding or dark colored stool.

I advise to continue the medications and advice as given by your doctor. If black stool will appear again or no improvement, should ask to consult with your gastroenterologist for further evaluation.

Wish fast recovery.
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What Causes Dark Stool After Colonoscopy?

Hi, I understand your concern. Before running into final conclusions, I d ask to send the full colonoscopy report to me, so I can analyze the findings and compare with your clinical symptoms. Sometimes, there is a light bleeding after the colonoscopy procedure, which is clinically expressed with dark stool (due to laceration of colon mucosa). That will be going in a few days. Next, you say that your doctor suggested to take Miralax, which is a gentle laxative. This makes me think you are suffering of constipation or hard stool. Miralax will help ease bowel movement (bm). Hard stool or constipation might cause laceration of colon/anal mucosa ending up with light bleeding or dark colored stool. I advise to continue the medications and advice as given by your doctor. If black stool will appear again or no improvement, should ask to consult with your gastroenterologist for further evaluation. Wish fast recovery.