肠易激综合征 (irritablebowelsyndrome ,IBS)是一种较为常见的慢性肠功能紊乱性疾病 ,其临床特点为持久存在而间歇发作的腹痛、腹胀、排便习惯及大便性状的改变 ,经相关检查无器质性病变证据的综合征。IBS在世界各地的发病率差别很大。在西方国家 ,IBS在成年人中的发病率约为 Irritable bowel syndrome (IBS) is a common chronic intestinal disorders, its clinical features are persistent and intermittent abdominal pain, abdominal distension, bowel habits and changes in stool traits, the relevant examination without Syndrome of qualitative evidence of the disease. The incidence of IBS varies widely across the world. In western countries, the incidence of IBS in adults is about