The authors' aim in this study was to explore the prevalence, symptomatology, and risk factors for peptic ulcer in a general adult population. Between December 1998 and June 2001, the authors surveyed a random sample (n=3,000) of the adult population (n=21,610) in two communities in northern Sweden using a validated questionnaire, the Abdominal Symptom Questionnaire (response rate=74%). A subsample (n=1,001) of the responders was randomly invited to undergo esophagogastroduodenoscopy and symptom assessment (response rate=73%). The prevalence of peptic ulcer was 4.1% (20 gastric ulcers and 21 duodenal ulcers). Nausea and gastroesophageal reflux were significant predictors of peptic ulcer disease, but epigastric pain/discomfort was not. Six persons with gastric ulcer and two persons with duodenal ulcer were asymptomatic. Eight subjects with duodenal ulcer (38%) lacked evidence of current Helicobacter pylori infection. Five (25%) of the gastric ulcers and four (19%) of the duodenal ulcers were idiopathic (no use of aspirin or nonsteroidal antiinflammatory drugs, no H. pylori infection). Smoking, aspirin use, and obesity were risk factors for gastric ulcer; smoking, low-dose (

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