Analysis of Gastrointestinal Symptoms of Outpatients With Functional Gastrointestinal Diseases（FGIDs） in Grade-A Tertiary Hospitals in China

Inclusion Criteria:

1. Symptoms has appeared for at least 3 months;

2. No organic disease and gastrointestinal alarm symptoms, which meet the diagnosticcriteria of FGIDs;

3. Sign informed consent and be able to read and understand the questionnaire.

Exclusion Criteria:

1. A history of organic gastrointestinal diseases;

2. Alarm symptoms of digestive tract (such as melena, weight loss, fever, abdominal mass,ascites, anemia, family history of gastrointestinal tumors, etc.)

3. Have a history of mental diseases;

4. Unable to read and understand the questionnaire.