Three questionnaires will be used in this study. The first is a Stool Form and Frequency Questionnaire (SFFQ). This questionnaire will be designed to determine the consistency of the stool based on standard consistency plots. The second questionnaire is designed to determine the duration and degree of IBS symptoms on visual analogue scores. This questionnaire is specifically administered before the first breath test and is designed to determine baseline symptoms and severity. The final questionnaire is a follow up questionnaire. This questionnaire also plots the degree of symptoms based on visual analogue scores. However, subjects are further asked to rank their degree of improvement based on percent improvement. In these last two questionnaires, subjects are asked to consider their answers as a summary of the preceding 7 days.