black coffee and dark stool

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New Member

Date Joined Mar 2008
Total Posts : 2
   Posted 3/9/2008 6:50 PM (GMT -6)   
Hi there,
          I just started drinking black coffee for the last week.i noticed my stools over the last day have been darker than normal.I am wondering if black coffee would turn my stools almost black.I have IBS for the last 15 yrs.Any response would be appreciated

Regular Member

Date Joined Jan 2003
Total Posts : 212
   Posted 3/9/2008 7:28 PM (GMT -6)   

Hi Holly


I'm also an ibs sufferer..for about 25 years now.  I've always drank coffee black and have never noticed that it produced a change in color of my stool.

Since it's only been a day or two, I'd wait and see if this continues..and definitely abstain from the black coffee for a few days while waiting. Black stools can be a sign of bleeding in the upper GI it's definitely something to keep and eye on and report to your Dr if it continues.  On the off chance...have you taken pepto bismal within the last few days? Taken any OTC drugs or supplements?  Pepto is well known to cause black stools..and some medications/food can cause temporary blackening also.


Let us know how you're doing after abstaining from the java.

Veteran Member

Date Joined Mar 2006
Total Posts : 1451
   Posted 3/9/2008 9:29 PM (GMT -6)   
No, I don't think black coffee would do this. I think many people drink black coffee and have no problem. Best way to find out is to stop the black coffee. It could be irritating the lining and causing bleeding but that is really a long shot.

Veteran Member

Date Joined Mar 2005
Total Posts : 2486
   Posted 3/9/2008 11:56 PM (GMT -6)   
I also don't think the dark stools would be a direct result of the coffee. If you've been taking anything with bismuth in it, like Denny mentioned, this would cause very dark stools. If you continue having this issue you should run it by your physician to make sure there's no upper GI bleeding.
Co-moderator - IBS Forum

Veteran Member

Date Joined Oct 2004
Total Posts : 3042
   Posted 3/10/2008 5:31 AM (GMT -6)   
Hi I have Crohn's and been drinking black coffee for over 30 years and have no diffrence in my stool. I would check with you Gi doctor.
Hi, I am teddybearweiser, I am a male.
I was diagnosed with crohns disease when i was admitted to the hospital
in 1992, in Jan of 1993 I was back in the hospital for surgery for my crohns. I had part of my right colon resectioned with ilecolonstomy.
 My GI doctor has me on Asacol, Dicyclomine,Imuran,Celebrex and Remicade. B-12 injection once a month.
My Internest doctor has me on Lisnopril-HTCZ and Folic Acid. Diagnosed
with Osteoarthritis July 2007

New Member

Date Joined Mar 2008
Total Posts : 2
   Posted 3/10/2008 7:00 AM (GMT -6)   
Hi there again,
                  THanks for the responses to my question.I have been reading with interest some of the symptoms that IBS sufferers have.Yesterday I had pain underneath my right rib cage which I attributed to many pockets of trapped gas.I did not realize that other IBS sufferers also experience this.I have been plagued with this symptom for many years,which is for me a part of my fibromyalgia which I have had since 1994.My IBS  alternates more constipation than Diarrhea.Oh well such is life.The only change that I have made in my diet was starting to drink my coffee black.I must say my stool is not black ,black just a little darker than normal.I know that eating beets and other food has a direct affect on the color of a person's stool,so I assumed that drinking black coffee would affect it also.Thanks for all the replies.I will continue to observe to see if this was a one time thing for me.Also I know the darker the stool the longer it has been in one's system,the lighter the shorter.
                                                                  Thanks Holly1

Regular Member

Date Joined Dec 2007
Total Posts : 354
   Posted 3/26/2008 2:36 PM (GMT -6)   
my stools are black if I drink more than a glass of red wine- just in case that could be the culpurt.
Jessica 26/F
Asacol 4pills /three times a day(from 2 pills/ three times a day)
Culturelle once daily
Tried (Entorcort EC 9ml/day and Prednisone)

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