Green stools in adults may be related to dietary influences, irritable bowel syndrome, functional dyspepsia, and bacillary dysentery. 1. Dietary influences: If you eat too much chlorophyll-containing food in a short period of time, such as greens, spinach, etc., it will lead to green stools. 2. Irritable Bowel Syndrome (IBS): patients usually manifest constipation, nausea, diarrhea, abdominal distension and other symptoms, and some patients may excrete green stools when they have diarrhea. 3. Functional dyspepsia: patients can be caused by abdominal pain, bloating, early satiety, belching, diarrhea and other symptoms, in the diarrhea is more serious can be discharged green stools. 4. Bacterial dysentery: mainly caused by Shigella infection, which can cause nausea, vomiting, diarrhea and other symptoms. If the diarrhea symptoms are more severe, green stools may be excreted. There are many other causes of green stools in adults, if the symptoms are serious or persistent, it is recommended to go to the regular hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment.