Adults with dark green stools are mostly related to diet and less likely to be cancerous. If patients have recently eaten more green leafy vegetables, such as spinach and chrysanthemum, the green color in stool is normal and patients should not worry too much. The color of stool can be restored to normal after dietary adjustment. If the color of stool is dark green, accompanied by acid reflux, heartburn, stomach distension and other symptoms, it may be related to indigestion. If a patient develops cancer of the digestive tract, commonly found in stomach, colon and rectum cancers, it can trigger changes in stool properties, such as black stools and increased frequency of stools, unrelated to dark green stools. Patients with dyspepsia should prioritize dietary adjustment, such as regular diet, chew and swallow slowly when eating, and avoid overeating. If the symptoms are not relieved, you can consult with the gastroenterology department and follow the doctor’s prescription to use morpholine, stomachic and antibiotic tablets, probiotics and other drugs to help promote digestion.