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Yellow/Pale Brown/Grey: Bright yellow diarrhea can signify a condition known as Giardiasis (see sidebar). Stool that is yellow or pale can also result from reduced production of bile salts, since a normal, brown-coloured stool acquires its hue from breaking down bile.
Although the color of stool can be affected by different foods and medications, it is typically brownish due to digestion of bile salts, digestive agents made by the liver and stored in the gallbladder. A reduction or absence of bile salts can cause the stool to become yellow or pale.ellow stool is unusual, and may be a symptom of a serious medical condition. Seek immediate medical care (call 911) for severe abdominal pain, stool with blood or pus, high fever (higher than 101 degrees Fahrenheit), significant vomiting, seizures, changes in mental status, or sudden behavior changes.