Dark green stools in adults are usually not cancerous and may be related to diet or caused by indigestion. If you have recently consumed a lot of green vegetables, such as spinach and celery, the green color of the stool is usually normal, so don’t worry too much and adjust your diet in time. If there are symptoms such as acid reflux, heartburn, bloating and loss of appetite, it may be indigestion caused by digestive disorders. Indigestion is a clinical syndrome caused by gastric motility disorder. Taking intestinal probiotics to adjust digestion can help restore normal digestive function. Cancer of the digestive tract can cause changes in stool characteristics, with symptoms such as black stools and blood in the stool, but rarely dark green stools. If you have abnormal stool characteristics, you should pay attention to your regular life, quit smoking and drinking, control your emotions, develop good living habits, avoid overeating and eat easy-to-digest food. If you still have dark green stools after dietary modification and medication, you can visit a gastroenterologist to clarify the cause.