To analyze the classification characteristics of gastrointestinal symptoms, the quality of life, the degree of anxiety and depression, and the satisfaction with the treatment of Chinese medicine in patients with FGIDs in Chinese Grade-A Tertiary Hospitals.

The characteristics of TCM（Traditional Chinese Medicine） syndromes and symptoms of the above-mentioned FGIDs will be analyzed, and the characteristics of TCM syndromes of FGIDs and their possible relationship with FGIDs subtypes will be analyzed.

Inclusion Criteria:

1. Symptoms has appeared for at least 3 months;
2. No organic disease and gastrointestinal alarm symptoms, which meet the diagnostic criteria 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.

Outpatients in Chinese Grade-A tertiary hospitals who has been diagnosed FGIDs