Semaglutide Unmasked a Hidden Insulin-Producing Tumor Causing Dangerous Low Blood Sugar | Research

The takeaway

Semaglutide therapy in a young woman with obesity and PCOS triggered severe hypoglycemia that led to the discovery of a previously undetected insulinoma.

Blood sugar 35 mg/dL
25-year-old on semaglutide with insulin level of 77.5 — leading to insulinoma diagnosis

What the researchers found

Semaglutide unmasked a previously undetected insulinoma in a young woman, presenting as severe refractory hypoglycemia requiring investigation.

Why it matters

As GLP-1 RAs are increasingly prescribed to young adults for weight loss, clinicians must recognize that unexplained severe hypoglycemia warrants investigation for insulinoma.

How the study worked

Case report with detailed clinical documentation including blood glucose (35 mg/dL), insulin (77.5 mU/L), C-peptide, and response to treatment.

What this study cannot tell us

Single case — rare circumstance; the frequency of insulinoma unmasking by GLP-1 RAs is unknown.

How to read the evidence

Case report — illustrates an important clinical scenario but cannot estimate frequency of this occurrence.

When this study was published

Published 2026 in Oxford Medical Case Reports.

The bigger picture

This case illustrates an important clinical lesson: GLP-1 RAs don't typically cause hypoglycemia, so severe low blood sugar on these drugs should trigger investigation for underlying pathology.

Questions still open

Should pre-GLP-1 RA screening include fasting glucose/insulin to rule out insulin-producing tumors?
How many insulinomas go undiagnosed because patients are not on GLP-1 RAs?

Common questions

Can semaglutide cause dangerously low blood sugar?

Semaglutide very rarely causes hypoglycemia on its own. In this case, the drug didn't cause the low blood sugar — it unmasked a hidden insulin-producing tumor (insulinoma) that was the true cause.

What is an insulinoma?

An insulinoma is a rare, usually benign tumor in the pancreas that produces excess insulin, causing dangerous drops in blood sugar. Most are curable with surgery.

Read the original research

Unmasking an insulinoma: recurrent Hypoglycemia in a young patient following GLP-1 receptor agonist therapy -A case report.

Oxford medical case reports, 2026(1), omaf283

View on PubMed ↗Publisher’s paper ↗

Citation

Baldera-Rodriguez, Nicole; Simo-Campillo, Natasha; Sanrregre-Oven, Patricia; Lopez, Enrique Capellan; Romano, Ramon; Goicochea, Anahi B. (2026). Unmasking an insulinoma: recurrent Hypoglycemia in a young patient following GLP-1 receptor agonist therapy -A case report.. Oxford medical case reports, 2026(1), omaf283. https://doi.org/10.1093/omcr/omaf283