A 42-year-old man with a 10-year history of alcohol abuse presents with acute epigastric pain, elevated serum amylase, and imaging findings consistent with acute pancreatitis. What is the most common cause of acute pancreatitis in this patient?

Explanation

## Most Common Causes of Acute Pancreatitis **Key Point:** Gallstones and alcohol account for approximately 80–90% of all cases of acute pancreatitis in developed countries. In this patient with a significant alcohol history, alcohol is the most likely etiology. ### Epidemiology by Cause | Cause | Frequency | Clinical Context | |-------|-----------|------------------| | **Gallstones** | 40–50% | Biliary colic history, female, older age | | **Alcohol** | 30–40% | Chronic alcohol use, male predominance | | **Idiopathic** | 10–15% | No identifiable cause | | **Post-ERCP** | 3–5% | Follows therapeutic ERCP | | **Hypertriglyceridemia** | 1–4% | Triglycerides > 1000 mg/dL | | **Medications** | 1–2% | Azathioprine, valproate, corticosteroids | | **Trauma** | < 1% | Blunt abdominal injury | **High-Yield:** In developed nations, gallstones are the single most common cause overall; however, in patients with documented chronic alcohol use (as in this case), alcohol becomes the leading etiology. The distinction is clinically important because it guides prevention and long-term management. **Clinical Pearl:** Alcohol-induced pancreatitis typically requires a threshold of chronic heavy consumption (> 50 g/day for men, > 35 g/day for women for several years). A single binge episode is unlikely to cause pancreatitis unless there is underlying pancreatic disease. **Mnemonic — GALLSTONE (causes of acute pancreatitis):** - **G** — Gallstones - **A** — Alcohol - **L** — Lipids (hypertriglyceridemia) - **L** — Ligation (post-surgical) - **S** — Steroids - **T** — Trauma - **O** — Obstruction (tumors, strictures) - **N** — Necrosis (autoimmune) - **E** — ERCP ### Why Alcohol in This Case? The patient has a 10-year history of alcohol abuse, which is a strong risk factor for recurrent and chronic pancreatitis. Alcohol causes direct toxic injury to pancreatic acinar cells and promotes ductal obstruction via protein precipitation. While gallstones remain the most common cause in the general population, in a patient with this alcohol history, alcohol is the most probable etiology.