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    What causes dark green colored stool?

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Posted on Tue, 1 Aug 2017 in Digestion and Bowels
Question: Hello. I am a 68 year old XXXXXXX woman and I have had something come up in the last two days that I am wondering about. My stool is dark green, the color of spirulina. I don't take spirulina except in two or three swallows of Odwalla Superfood Juice in the morning, but I have been doing that for years and never had green stool. So I asked myself, "OK what's new in my diet that could have caused this?" There are a couple of items that are new, but other than the obvious dietary cause, I'm wondering where this color comes from. I feel fine, my stool feels normal, and appears normal, except for the color. And this has been going on for about 2 to 2-1/2 days now, several times a day. So is this liver bile that is causing this color? I am starting to experiment with eliminating the new things in my diet to see if that is the cause, but wanted to ask about this anyway since it's so unusual.
doctor
Answered by Dr. Michelle Gibson James 1 hour later
Brief Answer:
increase in stool frequency or diet related

Detailed Answer:
HI, thanks for using healthcare magic

Green stool can be due to an increase in stool frequency or due to diet.

Normally as stool passes through the colon, the bile that is present in the stool undergoes changes that causes the color change from green to brown.
If the frequency of bowel movements increase then the bile does not have the time to undergo these changes and the stool appears green.

If there is no increase in stool frequency then the green color is due to some component of the diet- green coloring/dyed foods, green leafy vegetables. In some cases the use of foods with purple/blue or black dyes can also cause the green color to be seen.

In most persons, the green stool resolves on its own

I hope this helps, feel free to ask any other questions
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Michelle Gibson James 3 hours later
OK, thank you. Could be due to both diet and frequency. It seems normal otherwise, including the smell, so hopefully it will resolve on its own and I won't have to do anything more about it. Thank you so much, doctor, for your help. XXXXXXX Storm
YYYY@YYYY
doctor
Answered by Dr. Michelle Gibson James 24 minutes later
Brief Answer:
no problem

Detailed Answer:
No problem

If there are any other concerns, can let me know
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
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Follow up: Dr. Michelle Gibson James 20 hours later
As of last evening, 7/4/17, the problem had resolved itself and my stool is now back to its normal color. Huge relief. Thank you so much for your help. XXXXXXX Storm
YYYY@YYYY
doctor
Answered by Dr. Michelle Gibson James 1 hour later
Brief Answer:
yeahhh

Detailed Answer:
That's great.

That is what normally happens, glad that everything is okay now


Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Michelle Gibson James

General & Family Physician

Practicing since :2001

Answered : 16811 Questions

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