肠易激综合征(irritable bowel syndrome,IBS)是临床上最常见的一种胃肠道功能紊乱性疾患,是一组包括腹痛、腹胀、腹部不适、以大便习惯改变为主要特征,并伴大便性状异常,持续存在或间歇发作,而又缺乏形态学和生物化学异常改变等可用器质性疾病解释的临床症状。罗马Ⅲ诊断标准根据大便的性状将IBS细分为4个主要临床亚型,即IBS腹泻型(IBS-D),IBS便秘型(IBS-C),IBS混合型 Irritable bowel syndrome (IBS) is one of the most common gastrointestinal disorders in clinical practice. It is a group of major gastrointestinal disorders including abdominal pain, bloating, abdominal discomfort, bowel habits, bowel movements Abnormal, persistent or intermittent seizures, but lack of morphological and biochemical abnormalities and other available organic diseases to explain the clinical symptoms. According to the diagnostic criteria of Rome Ⅲ, IBS is subdivided into four main clinical subtypes according to the stool characteristics: IBS diarrhea (IBS-D), IBS constipation (IBS-C), IBS mixed