When your pancreas is damaged, it is not only the digestive-enzyme side that can suffer. The same organ makes the hormones that control blood sugar, and if enough of that tissue is affected, you can develop diabetes. Most people expect that part. What almost nobody is told is that the diabetes you get after pancreatitis is often a specific kind, called Type 3c or pancreatogenic diabetes, and it does not behave exactly like the Type 2 that everyone assumes.
This matters because Type 3c is frequently mislabelled as Type 2, and the wrong label can mean the wrong plan.
Here is the difference that counts. In Type 2, the body still makes insulin but resists it. In Type 3c, the damaged pancreas makes less insulin, and crucially it often makes less glucagon too, the hormone that pushes blood sugar back up when it drops. Lose both the brake and the accelerator and your blood sugar can swing harder in both directions. People with Type 3c can be more prone to lows, hypoglycaemia, not just highs. Doctors sometimes call this “brittle.” It changes how aggressively you want to push sugar down, because an overshoot is more dangerous when your body has lost its natural way to recover from a low.
The second difference is digestion, and the two problems usually travel together. The same damage that lowers your insulin often lowers your digestive enzymes, so many people with Type 3c also have exocrine pancreatic insufficiency. That is why a thorough team will check a faecal elastase test (a simple stool test for enzyme output) when they find pancreatogenic diabetes. Getting your enzyme replacement right is part of getting your blood sugar steady, because food you do not absorb is food your insulin dose was counting on.
There is even a treatment nuance worth being aware of, so you can have an informed conversation. Some diabetes medicines are more suitable than others here. Metformin is often a reasonable first choice and is generally favoured. Medicines that drive insulin hard and can cause lows, such as sulfonylureas, are used more cautiously given the hypo risk. If insulin is needed, it is managed carefully for the same reason. You do not need to memorise this. You need to know enough to ask whether your treatment fits a Type 3c picture rather than a standard Type 2 one.
Stepan’s Rule: If you are told you have diabetes after pancreatitis, ask the direct question: “Is this Type 2, or is this Type 3c?” Then ask: “Given that, what is my risk of going low, and is my enzyme level being checked too?” Those questions change the plan.
A short list to take to your appointment. Ask whether your diabetes is pancreatogenic given your history, not assumed to be Type 2 by default. Ask to have your faecal elastase checked so any enzyme insufficiency is caught and treated. Ask about your risk of lows and how to handle them. Ask which medicines suit your situation. And ask to have your fat-soluble vitamins and bone health watched, because malabsorption and Type 3c often share a patient.
None of this is meant to frighten you. Plenty of people manage this well once it is named correctly. The danger is not the condition. It is the condition wearing the wrong name and getting the wrong plan.
The questions to ask your team, including these, are gathered in the book as ready-to-use lists you can take to an appointment, so you are not trying to remember them under pressure.
Patient experience, not medical advice. Diagnosis and management belong to your medical team.