Acute pancreatitis is one of the major causes of acute abdomen. The diagnostic criteria for acute pancreatitis is any 2 of the following features: 1. tenderness and pain in epigastrium 2. elevated levels of serum, urine, and ascitic fluid's amylase and lipase 3. identification of features of acute pancreatitis on imaging Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2779365/ Image via: https://www.hopkinsmedicine.org/health/conditions-and-diseases/acute-pancreatitis