If it does persist: than you probably should be concerned but it most probably will not persist. This can happen when you are constipated and hard stool causes minor tears on the rectal mucosa. It could be hemorroidal bleeding too. The green color stool appears to be related to your diet or an artificial color inside the food or drink you have consumed.and not related to the fast transit time of the digested food.
Answered 12/30/2014
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