Etiology :
- Drugs : NSAIDs, ETOH, CA chemo.
- Infection : H. pylori (acute infection), virus
- Complication of other diseases : uremia
- Mucosal damage (shock, trauma, burns, surgery) = 'Stress'
Burns → Curling ulcer (↓ fluid volume → mucosal hypoxia)
Brain trauma → Cushing ulcer (↑CN 10 firing → ↑ gastric acid secretion)