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green stool

Posts: 44
Joined: Mar 2011

For three days now I have had a green stool. I didn't know for sure until today as I usually throw in the paper and flush without checking the toilet first. I see my oncologist Friday, as I had a PET scan last week due to a suspicious spot on my liver. I cannot think of any green food I ate. Do I need to be concerned? The color reminds me of the stuff I puked up while I was in the hospital, after the colon surgery. I have eaten green grapes, purple jello, and chicken. I didn't think I ate that many grapes.

idlehunters's picture
Posts: 1792
Joined: Apr 2009

I just got over C-DIF and it made my stool green. Now its gone and stool back to brown. You should ALWAYS look at your poop...always. It can tell you a lot. I'm sure others will chime in with opinions. Let us know what doc says. You take care.


pepebcn's picture
Posts: 6352
Joined: Aug 2010

just very dark or white are the suspicious ones!.......I think ! But you better check it with your onc.

Kathryn_in_MN's picture
Posts: 1258
Joined: Sep 2009

If it is green foamy diarrhea, there is usually bacteria involved. That is a concern.

Green stool if it is formed and normal otherwise, is no cause for concern. (My oncology dietician just told me this three weeks ago.)

Dark stool (black and tarry) is a concern for probable bleeding. And bright red with the stool is bleeding. Both of these need to be reported to your doctor immediately.

RickMurtagh's picture
Posts: 586
Joined: Feb 2010

If you are at all concerned calling your doctor is always a good choice. I don't have a colon, so my stools are never formed, but many foods make my output green, blueberries for example. Some meats turn my output green. The key to knowing when green output is good or bad is to pay attention to what you eat and what your stool is after. That way you have a better idea of when to be concerned.
I hope by now you have contacted your doctor if you still have green stools and have ruled out some food as the source.
Best wishes,

lisa42's picture
Posts: 3661
Joined: Jul 2008


I have been told that sometimes if you have diarrhea or just semi loose stools, that they may have not had enough time for the bile to turn them completely brown. Stools that are loose are have not had enough "bile time" can be yellow, orange, or green- supposedly it goes through those color phases before turning brown.

Another thought is that I have noticed when I take Pepto Bismal pink chewable tablets, that my stools turn a blackish green color. Also, excessive iron will turn your poop green (as well as will any green drinks, green supplements, etc).

If you are suspecting that you could have a bacterial infection, however, get it checked out. But just wanted you to know that there are other reasons that could be valid as to why it's that color.

Take care-

Posts: 44
Joined: Mar 2011

Saw onc today, and he thinks it is nothing to worry about, probably food related. It started 2 days after PET scan, so I wonder if it is related to that stuff you get injected with. My drinks have all been purple.

John23's picture
Posts: 2140
Joined: Jan 2007

My family in Italy would send their green stools to Ireland for St. Patty's day.

Just sayin'...

Green stool can be the result of an antibiotic acting on our system,
but yes, a PET with it's radioactive glucose can act like an antibiotic,
since the "low level" radiation can have that effect (killing/damaging cells).

If it "goes away", forget about it. If it continues, go to a different
physician.... like a gastrointestinal specialist.

But do watch what goes "in"; it can be the making of a rainbow!

"POO Rules!"

My best,


Posts: 44
Joined: Mar 2011

Finally brown today. I do celebrate the strangest things now.

John23's picture
Posts: 2140
Joined: Jan 2007

Brown stools!!!

Hallmark has a card for that:

"Green today, brown tomorrow,
we watch our stools through
happiness or sorrow;

Today we worry,
tomorrow brings hope,

But one thing is certain,
we're no dope.

With bowels and feces,
we do our bit.

Day after day,
we watch our ****.


($4.99 at Walmart)

Be well, dammit.


herdizziness's picture
Posts: 3642
Joined: Apr 2010

My Brown stools
Oh how they rule!!
But when they turn green
I have to ask,
what does that mean?
It could be weird bacteria
or something I ate
Was it the blueberry muffins
that I did bake?
Or that pistachio ice cream
that tasted like a lovely dream?
In my world it could be
many dire things, you see
colon cancer sure changes things
like pooh watching around that toilet
American Greetings
KMart Special

Yes, it is a thing our "pooh" that we need to keep aware of. Glad yours is back to normal. I never thought that every time I did Number 2, I would end up looking at it, even OMG even studying it, wondering if it looked normal. Ahhh, colon cancer indeed does change things a bit doesn't it? Glad yours "turned" out well.
Winter Marie

marqimark's picture
Posts: 242
Joined: Jun 2011

Reading this post has taught me a lot about Pooh.

I will have to watch my stools more closely now.

Thankfully I still have two thirds of my colon left and still have 'normal' stools to this point.

Hope all is well


marqimark's picture
Posts: 242
Joined: Jun 2011

So, I have to thank you guys for um um

Do you think reading about something can cause it????

Had a bright green BM today and I am blaming you guys!!!!

Seriously, I cannot believe I read about green stools and VIOLA I produce green stools.

I totally am stunned by the power of suggestion!!


geotina's picture
Posts: 2120
Joined: Oct 2009

Another cause of green stool can be eating foods (like frosting on a cupcake) that is blue in color.

Take care - Tina

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