Irritable bowel syndrome is a common gastrointestinal dysfunctional disease, the current incidence is about 10% to 15%. Common symptoms] 1. Pain: abdominal pain occurs after eating, usually in any part of the abdomen, most common in the lower abdomen and left lower abdomen, lasting several minutes to several hours, relieved after defecation or exhaustion. 2, abdominal distension: the most obvious during the day, abdominal circumference generally does not increase, after sleep at night to reduce. 3, diarrhea: common in the postprandial defecation, especially after breakfast, multiple defecation is more common, up to 10 times more and less, should not occur at night. 4, constipation: the main symptom is difficult to defecate, 1-2 times a week or once in 10 days, dry and small amount of stool, and with a small amount of mucus. 5, mental symptoms: occasional anxiety, depression, nervousness and other mental abnormalities. 6, Gastrointestinal symptoms: accompanied by a variety of functional disorders in the upper gastrointestinal tract and outside the intestinal tract.