The possible causes of acute abdomen are the following: 1. acute peptic ulcer and its complications; 2. acute cholecystitis; 3. acute pancreatitis; 4. acute intestinal ischemia; 5. acute appendicitis; 6. acute diverticulitis; 7. acute peritonitis; 8. ectopic tubal pregnancy with tubal rupture; 9. acute pyelonephritis; 10. acute ureteral colic; 11. diabetic ketoacidosis.