Normal stools are usually yellow in color. The color of stool for dark green normal or not depends on the situation, consume a lot of green vegetables can also make the stool for dark green, which is normal; may also be acute gastroenteritis and other intestinal diseases, gallstones and other liver and gallbladder diseases, which is not normal. 1. Diet-related: consumption of green vegetables, such as spinach, leeks, etc., may make the color of the stool for dark green, green vegetables contain a large number of chlorophyll and plant fibers, is not easy to be digested and absorbed, can lead to green stool. 2. Intestinal diseases: acute gastroenteritis, dysentery and other causes of diarrhea, intestinal peristalsis significantly accelerated, the food is too late to mix with the bile and absorption, the formation of bilirubin under the action of bacteria, resulting in dark green stools. 3. Hepatobiliary diseases: Hepatobiliary diseases, such as cholestatic cirrhosis, gallstones, biliary tract infections, etc., bile excretion abnormalities, can lead to dark green stools. The color of dark green stool in addition to physiological reasons, should go to the hospital to find out the cause, the doctor under the guidance of the cause of treatment.