Appendicitis and gastroesophageal reflux disease (GERD) are both prevalent diseases and might share similar pathological mechanisms. The aim of this study was to investigate the association between GERD and appendicitis using a large population-based dataset. This study used administrative claims data from the Taiwan Longitudinal Health Insurance Database 2005. We identified 7113 patients with appendicitis as cases, and 28452 matched patients without appendicitis as controls. This study revealed that GERD was found in 359 (5.05%) cases and 728 (2.56%) controls (p <0.001). Conditional logistic regression shows that the adjusted odds ratio (OR) of GERD for cases was 2.05 (95% confidence interval (CI): 1.08∼2.33) compared to controls. The adjusted ORs of prior GERD for patients aged 18∼39, 40∼59, and ≥60 years with appendicitis were 1.96 (95% CI: 1.56∼2.47), 2.36 (95% CI: 1.94∼2.88), and 1.71 (95% CI: 1.31∼2.22) than controls, respectively. We concluded that patients with appendicitis had higher odds of prior GERD than those without appendicitis regardless of age group.
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