Q: DKA (Diabetic Ketoacidosis) may present or along with upper GI bleed. What is the usual cause of it?

Answer: Erosion of esophagus

Upper gastrointestinal hemorrhage complicates 9% of diabetic ketoacidosis hospitalizations. The most common lesion is erosive esophagitis. Hemorrhage correlates with glucose level, admission to the ICU, duration of diabetes and the presence of diabetic complications.

Reference:

Faigel DO, Metz DC .- Prevalence, etiology, and prognostic significance of upper gastrointestinal hemorrhage in diabetic ketoacidosis. - Dig Dis Sci. 1996 Jan;41(1):1-8.