If the stool is completely green, it is abnormal. Normal human stool is yellow or yellow-green. When the stool appears greenish, consider that it may be related to eating a lot of green vegetables, which increases chlorophyll in the stool and stains the stool. When the intake of green vegetables is reduced, the color of the stool can change to yellow or yellow-green without any obvious damage to the body. If there is no special discomfort, it can be left untreated. Another condition is indigestion, eating a lot of high-protein food, greasy food, poor digestion and absorption ability of the body, too much acid accumulation in the intestinal cavity, with bile into the intestinal cavity of bilirubin, encountering air oxidation into biliverdin, making the stool dark green, there will also be a relatively strong sour, rotten smell. In this case, we should pay attention to adjust the diet, eat more coarse grains and light, easy to digest, easy to absorb food, the symptoms are serious, we should give medication to adjust. However, if the stool appears completely green, go to the hospital for further examination and clear diagnosis.