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Green: 1  Green stools are always normal, but they can be mistaken for black stools. 2  Bile. Most dark green stools are caused by bile. 3  Green stools are more common in formula fed than breastfed infants. It can be normal with both.  Green stools are more common with diarrhea. This is due to a fast transit time through the gut.
What causes dark green stool and stomach cramps? I have dark green stool, stomach cramps, constant gurgling, bloating, and my stomach is tende... What does having yellow or green mucus mean? What causes you to cough up black phlegm?