Diarrhea is cyan divided into physiological and pathological two: 1, physiological, diarrhea for cyan consider with the recent diet has a certain relationship, may be because of the recent consumption of green vegetables, or other green fruits and vegetables more or iron supplements, and the patient intestinal absorption function is poor, will lead to diarrhea and appear cyan stool, change the diet structure, the color of the stool will return to normal. After the cold will appear diarrhea green stool, avoid cold, spicy food, pay attention to abdominal warmth, eat more warm food. 2, pathological, if the phenomenon still exists after changing the diet structure, ulcerative colitis, Crohn’s disease, tumors, etc. can cause changes in stool color traits, need to go to the gastroenterology department for further examination and treatment, can not blindly use drugs.