Salmonella - can cause greenish stool (usually diarrhea)
Giardia - can cause greenish stool (usually diarrhea)
Swallowed postnasal drip - ie. from an upper respiratory disorder
Intestinal disorder
Starvation stools - usually in children; green watery stool caused by being on a liquid diet for a few days (e.g. if ill)
See also dark stool, blood in stool, or stool color changes
Normal breast-fed baby
Gastroenteritis
Certain foods
Some cow milk formulas
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It is not meant to substitute for medical advice provided by your physician or other medical professional.
If you have or suspect that you have a medical problem, promptly contact your physician or health care provider.