Possible causes of green stools include indigestion, intestinal flora imbalance, and too much green leafy vegetables in the diet. 1. Indigestion: under normal circumstances, bile is mixed in the food digestion process, and after reacting with the digestive juices, the color of the stool is usually yellow. In the case of indigestion, gastrointestinal dysfunction, fast intestinal peristalsis leads to faster passage of food, alkaline digestive juices do not sufficiently neutralize the acidity of feces, and the bile in the feces produces bilirubin in such an acidic environment, resulting in a greenish color of the feces. 2. Intestinal flora imbalance: at this time, the probiotic flora in the intestinal tract is inhibited, harmful bacteria grow in large numbers, the feces are acidic, and the bile in the feces produces a large amount of biliverdin in the acidic feces, resulting in changes in fecal form and color. 3. Too much green leafy vegetables in the diet: such as a one-time intake of a large number of spinach, baby greens, oleaginous vegetables and other foods, beyond the human body’s ability to digest and absorb, chlorophyll caused by the color of the stool for dark green. There is no need to worry at this time, after changing the dietary structure of the stool can be returned to normal on its own. It is recommended that patients with long-term changes in the color of their stools consult a doctor in time to find out the cause of the problem and then treat it.