Stool color is usually explained by diet, but certain shades — especially tarry black or unexplained bright red — can signal a condition that needs medical attention.
Like pale brown bowel movements, white bowel movements indicate that there may not be enough bile in your digestive process. If you have repeated white bowel movements, you should talk to your doctor about the condition. The liver is responsible for bile production, so a lack of it may indicate liver disease. It can also be an issue with your gallbladder, such as gallstones or having had your gallbladder removed in the past. There are other less serious causes, like having been made to take barium prior to an x-ray, but if the problem persists, you should see a physician for a diagnosis.

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