What Does Yellow Diarrhea Mean?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
Yellow diarrhea can occur when stool moves quickly through the digestive system, and yellow, greasy, foul-smelling stools may be a sign of fat malabsorption. Color alone cannot identify the cause. When stool moves quickly through the intestines, bile pigments may not have enough time to undergo the changes that normally turn stool brown, so the stool may look yellow or green. Fat malabsorption, often caused by conditions like celiac disease or pancreatic insufficiency, can also produce yellow, greasy stools. Infections and medicines such as antibiotics can cause diarrhea, while foods and artificial coloring may change stool color. Many cases of acute diarrhea improve within a few days. Contact a health care professional sooner if diarrhea lasts more than 2 days in an adult or more than 1 day in a child, or if there is dehydration, frequent vomiting, high fever, severe pain, blood or black stool, or six or more loose stools in a day. Infants, older adults, pregnant people, people taking antibiotics, and those with weakened immune systems or serious health conditions may need earlier advice.
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