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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.
Bile salt-related causes of yellow stool. Yellow stool may be caused by conditions that decrease the amount of bile salts reaching the intestines including: Biliary atresia (a condition present at birth involving abnormal bile duct development). Biliary cirrhosis (inflammation of bile ducts in the liver).ellow stool can also be caused by conditions that interfere with the ability of the intestines to absorb fat: Celiac disease (a severe sensitivity to gluten from wheat and other grains that causes intestinal damage). Cystic fibrosis. Parasite infections such as Giardia infection.