Definition
Pancreatitis is inflammation of the pancreas. Acute pancreatitis causes upper-belly pain that may spread to the back and needs a doctor right away. It was uncommon in GLP-1 trials, but every GLP-1 label warns about it.
The pancreas sits behind the stomach and makes insulin and digestive enzymes. Pancreatitis happens when those enzymes damage the pancreas. It can be acute, starting suddenly and usually getting better in several days with treatment, or chronic and lasting. The NIDDK lists gallstones, heavy alcohol use, genetic disorders and some medicines as common causes, and high triglycerides and diabetes as risk factors.
Every GLP-1 label tells prescribers to watch for persistent or severe belly pain, sometimes spreading to the back, with or without vomiting, and to stop the medicine if pancreatitis is suspected. The numbers are small. In Wegovy weight trials, confirmed cases were 0.2 per 100 patient-years vs less than 0.1 on placebo. In Zepbound weight trials, 0.2% of people had it on the drug and 0.2% on placebo. Gallstones are a separate label warning and also a cause of pancreatitis.
Seek care right away for severe or worsening belly pain, vomiting, fever, a fast heartbeat, or yellow skin or eyes. Do not restart your GLP-1 until your prescriber says so. At GLP-1 SOS, this is one symptom we always send straight to a doctor.
In the Lab
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- How much water should I drink on a GLP-1?
From the people behind the Lab
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Sources (4)
- Definition & Facts for Pancreatitis. NIH National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).
- Symptoms & Causes of Pancreatitis. NIH National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).
- Wegovy (semaglutide) injection and tablets, Prescribing Information. Novo Nordisk / FDA, revised June 2026.
- Zepbound (tirzepatide) injection, Prescribing Information. Eli Lilly, revised August 2026.
Reviewed by the GLP-1 SOS editorial team · Education, not medical advice · Talk to your prescriber about your dose and your symptoms.
