Common Causes of Acute Pancreatitis

Acute pancreatitis results from premature activation of pancreatic enzymes within the gland, leading to autodigestion and inflammation. The most common causes are biliary and toxic/mechanical in nature, remembered classically by the mnemonic "I GET SMASHED" (Idiopathic, Gallstones, Ethanol, Trauma, Steroids, Mumps, Autoimmune, Scorpion sting, Hyperlipidaemia/Hypercalcaemia, ERCP, Drugs). Each option is analysed below.

Option-wise Analysis

• 1. Gallstone: Gallstones are the single most common cause of acute pancreatitis worldwide, accounting for roughly 40-50% of cases. A stone impacted at the ampulla of Vater causes obstruction of the pancreatic duct and reflux of bile, triggering enzyme activation. This is a well-established cause.
• 2. Alcohol: Chronic and binge alcohol use is the second most common cause of acute pancreatitis (about 25-35% of cases), causing direct acinar cell toxicity and duct plugging with protein precipitates. This is a well-established cause.
• 3. Post-ERCP: Endoscopic Retrograde Cholangiopancreatography (ERCP) is a recognised iatrogenic/procedural cause of acute pancreatitis, occurring in a meaningful proportion of patients undergoing the procedure due to mechanical trauma and hydrostatic injury to the pancreatic duct. This is a well-established cause.
• 4. Campylobacter jejuni: Campylobacter jejuni is a gastrointestinal pathogen classically associated with Guillain-Barre syndrome and reactive arthritis, not with acute pancreatitis. Among infectious causes of pancreatitis, the recognised organisms are mumps virus, coxsackievirus, cytomegalovirus, and certain parasites (e.g., Ascaris) — Campylobacter jejuni does not feature among the accepted infectious causes of pancreatitis.

Conclusion

Gallstone, Alcohol, and Post-ERCP (factors 1, 2, and 3) are all well-recognised common causes of acute pancreatitis, whereas Campylobacter jejuni (factor 4) is not an accepted cause of pancreatitis and is instead linked to other conditions such as Guillain-Barre syndrome.

Therefore, the correct combination is 1, 2 and 3.