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Irritable bowel syndrome is a common intestinal disorder that is characterized by bloating, abdominal pain, diarrhea, cramping, and constipation. Typically no abnormalities appear during standard medical testing, and so irritable bowel syndrome is identified by the symptoms. Although irritable bowel syndrome can cause serious discomfort, the intestines are not harmed.
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Green stool. Green stool may be caused by green or artificially colored foods, iron supplements, or decreased colonic transit time
The liver constantly makes bile, a bright green fluid, that is secreted directly into the small intestine or stored in the gallbladder. Continue reading about the causes of green stool.
From Cathy Wong,
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The liver constantly a bright green fluid called bile that is secreted into the small intestine or stored in the gallbladder.
Bile is needed to absorb fats and fat soluble vitamins. It also helps to soften stools and is responsible for giving stools their characteristic brown color.
As bile makes its way through the intestines, it progressively changes color from green to yellow to brown, due to the action of bacteria in the large intestine on the bile salts.
Green stool often indicates that food has passed through the intestines faster than normal (called decreased bowel transit time), before it could be changed from green to brown.
Diarrhea decreases bowel transit time, so any condition that causes diarrhea can result in green stool.
Other causes of green stool include:
Laxative use
Antibiotic use
Medication side effects
Food poisoning
Celiac disease
Ulcerative colitis
Crohn's disease
Malabsorption
Irritable bowel syndrome
Bacterial overgrowth
Infectious diarrhea - especially salmonella and giardia
Traveler's diarrhea
Cancer
Foods and supplements that can cause green stool include:
Chlorophyll
Iron supplements
Algae
http://altmedicine.about.com/od/gettingdiagnosed/a/green_stools.htm