The potential study subject will be identified by the investigators by face-to-face visit, and there will be only 1 visit in this study. Every patient will complete both ROME IV and the Simplified Diagnosis Tool during the visit, and in the same day.~The study will collect results of the ROME IV and the Simplified Diagnosis Tool. Sensitivity and specificity of simplified diagnosis methodology compared with ROME IV will be analysed after all the data has been collected.
The study is a multi-centre, observational study which enrolls 150 IBS-C patients and 150 non-IBS-C patients in China.