A green stool is one of the symptoms that might be seen in irritable bowel syndrome. The bile from the liver turns green at one point of its metabolic degradation. It changes the color further, but if it is expelled too fast due to increased bowel movement (as might be in diarrhea-dominant irritable bowel syndrome), then the stool might turn out green. Other conditions that might cause the stool to turn out green might include: bacterial overgrowth, increased use of antibiotics that might affect the bacterial intestinal flora, laxative use, etc.
You might want to visit your family doctor for a physical examination and a stool culture. You might be referred to a specialist for internal diseases, which might need additional examinations (colonoscopy, liver tests).
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