Cigarette Smoking and its Association with Overlapping Gastroesophageal Reflux Disease, Functional Dyspepsia, or Irritable Bowel Syndrome

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Background Gastroesophageal reflux disease (GERD), functional dyspepsia (FD), and irritable bowel syndrome (IBS) are common gastrointestinal diseases. Several studies have shown a significant occurrence of overlap among these 3 diseases. The purpose of this study was to examine the factors associated with such disease overlap in Japanese adults. Methods We performed a cross-sectional study on Japanese workers who visited a clinic for a routine health check-up and asked them to fill out a self-report questionnaire. GERD was defined as episodes of heartburn and/or acid regurgitation at least once a week, and the diagnosis of FD and IBS was based on Rome III criteria. A logistic regression model was used to identify risk factors, and odds ratio (OR) was calculated with 95% confidence intervals (CIs). Results Disease overlaps were found in 160 (6.0%) of the 2680 eligible subjects. Female gender was associated with GERD + IBS (OR=1.99; 95% CI, 1.06-3.75), and FD + IBS (OR=1.72; 95% CI, 1.03-2.85), and lower body mass index was negatively associated with FD + IBS (OR=0.54; 96% CI, 0.34-0.87). Cigarette smoking was a common factor associated with the overlaps: GERD + FD (OR=2.14; 95% CI, 1.22-3.76), GERD + IBS (OR=3.16; 95% CI, 1.75-3.71), FD + IBS (OR=2.26; 95% CI, 1.40-3.66), and GERD + FD + IBS (OR=4.08; 95% CI, 1.66-10.07). The associations between smoking habits and overlaps were stronger in smokers who smoked ≥1 pack per day as compared to those who smoked <1 pack per day. Conclusion Cigarette smoking was significantly associated with overlaps among GERD, FD, and IBS in Japanese adults.

Cigarette Smoking and its Association with Overlapping Gastroesophageal Reflux Disease, Functional Dyspepsia, or Irritable Bowel Syndrome

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