Pain is the most common symptom and is often characterized by:
Persistent
Localizes to epigastric area, around waist, RUQ, or occasionally LUQ
Radiates to back
The onset may be less abrupt and the pain poorly localized
Nausea/vomiting noted in most
Abdominal distention is frequent complaint
Cullen sign (ecchymosis of periumbilical region) - intrabdominal hemorrhage
Turner sign (ecchymosis of flanks) - retroperitoneal hemorrhage
Pulmonary Findings
Hypoxemia, ARDS, tachypnea
Indicates severe<unk> 
Diaphragmatic inflammation, pancreatico-pleural fistula
Persistent
Localizes to epigastric area, around waist, RUQ, or occasionally LUQ
Radiates to back
The onset may be less abrupt and the pain poorly localized
Hypoxemia, ARDS, tachypnea
Indicates severe<unk> 
Diaphragmatic inflammation, pancreatico-pleural fistula
Diaphragmatic inflammation, pancreatico-pleural fistula
Acute pancreatitis
Gastroesophageal reflux disease 
Acute calculous cholecystitis
Peptic ulcer disease with or without perforation
Chronic pancreatitis
Gastritis
Duodenal hematoma
Pancreatitis