The commonest cause of acute pancreatitis is
Major cause of acute pancreatitis is biliary calculi(50-70% of patients) A careful search of aetiology is must before labelling idiopathic and no more than 20% cases should fall into this category. Bailey & Love 26th edition,1127,1128.
Biliary calculi
Alcohol abuse
Infective
Idiopathic
G.I.T