BACKGROUND/AIMS: Dyspepsia is very common in the community. The aim of this study was to assess the frequency of various causes of dyspepsia. METHODS: Two hundreds nine patient with dyspepsia were investigated. Basic laboratory screening, ECG, Upper gastrointestinal endoscopy or upper gastrointestinal barium study, upper abdominal ultrasound were performed in every dyspeptic patients. RESULTS: Functional dyspepsia was the cause of symptoms in 92.3%, peptic ulcer in 2.9% (duodenal ulcer in five patients, gastric ulcer in one patient), reflux esophagitis in 0.5%, esophageal ulcer in 0.5%. Of dyspeptic patients, gallstone was found in 1.4%, gastric submucosal tumor in 1.0%, fatty liver in 1.9% (two of four patients with fatty liver had elevated transaminase), upper gastrointestinal cancer in 0%. Of functional dyspepsia patients, women was 60.3%, men was 39.7%. CONCLUSIONS: The most common cause of dyspepsia was functional dyspepsia. Various causes of organic dyspepsia was peptic ulcer, reflux esophagitis, and esophageal ulcer.