Green stools are caused by indigestion, imbalance of intestinal flora, and excessive intake of green vegetables. When the body has indigestion, not only will nausea, vomiting, bloating, abdominal pain, some people will also be accompanied by diarrhea symptoms. At this time, the food residues in the intestine exist for a relatively short period of time, and the bilirubin in the food residues does not have time to react with the alkaline substances in the intestine, and at the same time, because the fecal environment is acidic, it will be oxidized to bilirubin, resulting in a green color of the stool. When Pseudomonas aeruginosa grows excessively in the intestine, it not only affects the absorption function of the intestine, but also causes irritation to the intestinal mucosa, resulting in pus and exudate along with the stool, and these thick juices and exudate will form green, so the stool will also turn green. Some people have green stools because of dietary problems, such as excessive intake of green foods, which can lead to green stools because chlorophyll cannot be absorbed and metabolized by the body.