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Abstract Introduction: In different countries, different etiologic factors are considered to be responsible for acute pancreatitis. Objective: In this study we tried to determine the relative frequency of etiologic factors of acute pancreatitis in our patients. Materials and Methods: This study is a retrospective one and we studied all patients with documented acute Pancreatitis in Poursina and Razi Hospital. 158 patients were studied from 1994-1999. Data were processed. Results: From 158 pt, 97(61%) were female and 61 were male (39%). The ratio of female to male was 1.59. Most patients were 41-50 years old. For 78pts (49%), the etiologic cause was unknown, (Idiopathic). Known causes included: Biliary stone (41%), Alcohol (3.3%), previous surgery (1.9%), and trauma (0.63%). Mortality rate was 13.3% (21pts) with highest rate in 61-70 year old age group. Diagnoses of 17 cases were revealed after explorative laparatomy. Conclusion: In this study in 49% of Pancreatitis, the etiologic causes weren’t known in other studies 7-21% of Pancreatitis were idiopathic. It may be due to missing of other causes the biliary stones were the most were the most cause of acute pancreatitis. This is different from other studies in American & European countries.

Keywords: Abdominal Pain, Pancreatitis, Pancreatitis- Etiology, Pancreas

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