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In the UK and US, the main causes are gallstones and alcohol.
Use the mnemonic 'I GET SMASHED':
Idiopathic
Gallstones
Ethanol
Trauma
Steroids
Mumps / Malignancy
Autoimmune
Scorpion stings
Hypercalcaemia / Hypertriglyceridaemia / Hypothermia
ERCP
Drugs (including azathioprine, mesalazine, bendroflumethiazide, furosemide, steroids, sodium valproate)