Summary: Hypoglycemia is an uncommon clinical problem in non-diabetic patients or patients not being treated for diabetes mellitus. It is a rare, but well-established complication of bariatric surgery and, in some cases, it can be the only symptom of another medical problem. A 50-year-old woman with a history of partially recovered hypopituitarism after transsphenoidal surgery for a non-functioning pituitary macroadenoma complained about symptomatic hypoglycemia after sleeve gastrectomy surgery. Our initial studies failed to determine the cause for these episodes and treatment with acarbose (suspecting a dumping syndrome) was not helpful. Finally, laboratory findings revealed growth hormone (GH) deficiency. The patient received treatment with GH, with the resolution of symptoms after 3 months of treatment. Our case suggests that all causes of hypoglycemia should be considered and studied after bariatric surgery. An improvement in insulin-resistance following bariatric surgery can trigger clinical manifestations of GH deficiency.
Learning points: Postprandial hypoglycemia after bariatric surgery is usually due to dumping syndrome. Even after bariatric surgery, all causes of hypoglycemia should be considered and studied. After significant weight loss, insulin sensitivity is usually restored and can trigger clinical manifestations of GH deficiency. Hypoglycemia is a rare symptom of GH deficiency.