Green stool is not necessarily a precursor to any disease, but may be caused by food factors, indigestion, intestinal flora imbalance, etc. 1. Food factors: may be caused by eating green food, such as greens, spinach, which contains more chlorophyll, will easily lead to stool color green. 2. Indigestion: mainly due to the food intake, not be able to be timely digested, in the gastrointestinal tract to stay a long time, easy to lead to green stool. 3. Intestinal flora imbalance: the decrease of beneficial bacteria in the intestinal tract and the increase of harmful bacteria, part of the harmful bacteria will react with the food residue, affecting the nature of feces, leading to green stools. Green stool may also be caused by other reasons, such as enteritis, if the symptoms persist, you should consult a doctor in time to identify the cause of targeted treatment.