Stool Color Changes (cont.)
Benjamin Wedro, MD, FACEP, FAAEM
Benjamin Wedro, MD, FACEP, FAAEM
Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.
Bhupinder Anand, MD
In this Article
What are symptoms of stool color changes?
Changes in stool color alone do not cause symptoms. The underlying cause of the change in stool color, texture, or form is responsible for any symptoms.
If stool passes through the intestine too quickly, there might not be enough time for bile to be digested and broken down to provide the normal brownish stool color. Bile that is chemically changed by bacteria in the intestine can be greenish-brown. It takes time for the bile to be fully changed in the intestine and become brown again, and if the transit time is short, the stool remains green colored.
Green stools may be a normal variant. It can also be caused by a diet rich in green vegetables, especially spinach. Iron supplements also may be a cause, though iron often turns stool black.
Yellow, greasy, and foul smelling stool
There are a variety of reasons why stool will be yellow, greasy, and foul smelling. It can be due to the intestine's inability to digest and absorb fat because of diseases of the intestinal lining (such as in celiac disease and cystic fibrosis) because the pancreas is unable to manufacture adequate digestive enzymes (such as with chronic pancreatitis or pancreatic cancer that blocks the pancreatic duct, or there is not enough bile being delivered to the intestine (such as in cancer of the liver or bile ducts that block delivery of bile to the intestine). The yellowness, greasiness, and foul smell is due to the undigested fat.
Medically Reviewed by a Doctor on 9/16/2015
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