Acute pancreatitis is inflammation of the pancreas that occurs suddenly.
Abdominal pain is the most prominent symptom of acute pancreatitis.
It is diagnosed by at least two of the following: characteristic abdominal pain, serum amylase or lipase levels ≥3 times the upper limit of normal and characteristic abdominal imaging findings.
Mild acute pancreatitis does not have any organ failure or local or systemic complication.
Moderately severe acute pancreatitis has the presence of local or systemic complication and/or transient organ failure in <48 hours.
Severe acute pancreatitis has organ failure persistent in >48 hours.