What Happens If Your Pancreas Is Removed?

Removing the pancreas entirely, a procedure called total pancreatectomy, leaves you without the organ responsible for producing insulin, glucagon, and the digestive enzymes that break down food. The result is an immediate, permanent form of diabetes and an inability to digest fats and proteins without taking enzyme capsules with every meal. People do survive and live years after the surgery, but daily life requires careful management of blood sugar and nutrition for the rest of your life.

Why Would the Pancreas Be Removed?

Surgeons don’t take out the entire pancreas lightly. The most common reason is a locally advanced or centrally located pancreatic tumor that can’t be safely removed with a partial resection. In these cases, the goal is complete clearance of the cancer. A specific type of precancerous growth called intraductal papillary mucinous neoplasm (IPMN) has become one of the leading indications in recent years.¹

Cancer isn’t the only reason, though. Some people with severe chronic pancreatitis suffer debilitating pain that doesn’t respond to other treatments. For them, removing the pancreas can be the last option for relief. The indications in this group have expanded over time to include hereditary or genetic forms of pancreatitis, certain benign tumors, and situations where a remaining stump of pancreas from an earlier surgery poses ongoing risk.²

You Will Develop Diabetes Immediately

The pancreas houses clusters of cells called islets of Langerhans that produce insulin and glucagon, two hormones that keep blood sugar in a narrow range. Once the organ is gone, your body can no longer make either one. The resulting condition is classified as type 3c diabetes, a distinct form that arises specifically from damage to or removal of the pancreas.³ You’ll need insulin injections or an insulin pump from the day of surgery onward, and this won’t change.

What makes type 3c diabetes harder to manage than the more familiar type 1 or type 2 is the simultaneous loss of glucagon. Normally, when blood sugar drops too low, glucagon signals the liver to release stored glucose and pull you back to a safe range. Without a pancreas, that safety net is gone. Studies of patients who had a total pancreatectomy show that after eating, blood sugar can spike high and then crash into hypoglycemia, with glucagon levels staying flat the entire time. The body simply has no counterregulatory hormone to catch the fall.⁴ This pattern of high-then-low blood sugar is one of the most dangerous and disruptive daily challenges after the surgery.

Digesting Food Without a Pancreas

The pancreas also produces enzymes, primarily lipase, amylase, and protease, that your gut needs to break down fats, carbohydrates, and proteins. Without these enzymes, food passes through only partially digested. Fat is the biggest casualty. Undigested fat causes steatorrhea, which is pale, oily, foul-smelling stool. Beyond the unpleasant bathroom symptoms, this means your body isn’t absorbing calories or fat-soluble nutrients properly, leading to weight loss and abdominal pain.⁵

The fix is pancreatic enzyme replacement therapy, or PERT. You take capsules containing synthetic versions of those enzymes with every meal and snack. Starting doses are typically in the range of 40,000 units of lipase per meal and about half that with snacks, split into portions throughout eating.⁶ Getting the dose right matters more than many patients realize. A systematic review found that when people took lower-than-recommended doses, their diarrhea improved, but their nutritional status did not. Only those taking guideline-level doses saw benefits in both symptom control and actual nutrition.⁷ In other words, feeling better and actually absorbing your food properly are not the same thing.

Fat-Soluble Vitamin Deficiencies

Because fat absorption is impaired, vitamins that dissolve in fat, specifically A, D, E, and K, tend to become deficient after the pancreas is removed. This happens even when patients are taking enzyme replacement. A large study tracking patients after total pancreatectomy found that at one year, about a quarter had low vitamin A, roughly one in five had vitamin D deficiency, and about one in ten had low vitamin E. All of these rates were significantly worse than before the surgery.⁸ A separate study focused on children found similar deficiency rates, with vitamin D low in about a quarter of kids regardless of enzyme or supplement use.⁹

There is a practical intervention worth knowing about. Patients who took a fat-soluble multivitamin designed specifically for pancreatic insufficiency had a meaningfully lower risk of vitamin D deficiency. The catch is that adults were far less likely than children to keep taking these vitamins at follow-up, with only about a third of adults staying on them compared to two-thirds of children.⁸ If you or someone you know has had this surgery, sticking with those specialized vitamins is one of the simplest things that actually helps.

Islet Autotransplantation Can Soften the Blow

When the pancreas is being removed for chronic pancreatitis rather than cancer, surgeons can sometimes harvest the insulin-producing islet cells from the organ before it’s taken out and infuse them into the patient’s liver. The liver provides a blood-rich environment where transplanted islets can engraft and continue producing at least some insulin. The goal isn’t to prevent diabetes entirely but to preserve enough endocrine function to keep blood sugar more stable and reduce the severity of the diabetes that follows.¹⁰

The results vary widely from person to person. In a recent study, about one in five patients who received islet autotransplant were completely insulin-independent at one year, meaning they didn’t need insulin injections at all. The average HbA1c for the group was around 7%, which is a reasonably well-controlled level.¹¹ But even among those who still needed insulin, the transplanted islets often provided enough baseline function to prevent the dangerous blood sugar swings described earlier. This procedure isn’t available to cancer patients because there’s a risk of transplanting cancer cells along with the islets.

Even with islet autotransplant, the glucagon problem persists. Research shows that transplanted islets don’t restore the glucagon response during hypoglycemia. After a meal, blood sugar can still climb and then drop sharply with no glucagon release to cushion the fall.⁴ So while islet autotransplantation is a meaningful advantage, it doesn’t solve every metabolic problem that follows total pancreatectomy.

The Liver Tends to Accumulate Fat

An underappreciated consequence of losing the pancreas is what happens to the liver. A prospective study following patients for a year after pancreatic resection found that more than half developed increased liver fat, even though most of them were actually losing body weight. Some individual cases were dramatic, with one patient’s liver fat content jumping by 80 percentage points.¹²

A systematic review confirmed this isn’t a fluke. New-onset fatty liver disease can develop within a year of pancreatectomy with an incidence as high as 75%. The risk factors include the extent of the resection, poor nutrition around the time of surgery, pancreatic exocrine insufficiency, and having had cancer as the reason for the operation.¹³ The mechanism likely involves the new diabetes, altered insulin delivery (especially when islets are transplanted into the liver, bathing it in locally high insulin concentrations), and disrupted fat metabolism from the loss of exocrine function. For patients and their doctors, this means liver health needs monitoring in the years after the surgery, not just blood sugar and digestion.

The Spleen Often Goes Too

Depending on the tumor location and the surgical approach, the spleen may be removed along with the pancreas. The tail of the pancreas sits right against the spleen, and the blood supply to both is intertwined. In one surgical series, splenectomy was performed in over half of patients undergoing distal or total pancreatectomy. Patients who lost their spleen had a higher rate of complications compared to those who kept it, though the difference wasn’t statistically significant in that study.¹⁴

Losing the spleen has its own set of consequences. The spleen filters bacteria from the bloodstream, and without it, you’re at higher lifelong risk for serious infections from encapsulated bacteria like pneumococcus and meningococcus. People who’ve had a splenectomy need specific vaccinations and sometimes carry a course of emergency antibiotics. When the spleen comes out alongside the pancreas, you’re managing not just diabetes and digestive problems but also an altered immune system.

Weight Loss, Rehospitalization, and Quality of Life

Weight loss after total pancreatectomy is the rule, not the exception. One study documented a median loss of about 7 kilograms at three months, nearly 9 kilograms at six months, and roughly the same at one year.¹⁵ Some of this reflects recovery from cancer or chronic illness, but the ongoing malabsorption from enzyme insufficiency plays a real role even with PERT.

Readmission to the hospital is common. In the same study, more than half of patients needed rehospitalization within the first year. Blood sugar emergencies are a major driver. A French series found that over half of surveyed patients had been readmitted specifically for diabetes-related problems, and every single one reported at least one episode of hypoglycemia in the past month. HbA1c levels averaged around 7.8%, indicating that blood sugar control remains imperfect in practice.¹⁶ Quality-of-life assessments consistently show that fatigue, diarrhea, flatulence, and eating-related difficulties are the symptoms that hit daily life hardest.

That said, people do adapt. Physical and mental quality-of-life scores are lower than the general population’s, and younger patients and those with persistent abdominal pain tend to report the worst outcomes.¹⁷ But many patients, especially those who had the surgery for intractable pancreatitis pain, describe a net improvement. Life is more medically complex, but the absence of the excruciating pain that dominated their lives before surgery can outweigh the new daily burdens.

Survival Depends Heavily on Why the Surgery Was Done

Perioperative mortality for pancreatectomy has declined substantially, dropping from about 8% to under 5% over a recent span tracked in national data.¹⁸ The procedure is no longer the near-death sentence it once was, but it remains major surgery with real risk.

Long-term survival splits sharply by diagnosis. In one single-center study, estimated three-year survival for the entire cohort was 65%, but for those with pancreatic adenocarcinoma specifically, it was only 34% at three years.¹⁵ Another series reported five-year overall survival of 55%, with deaths related to the surgery itself including hypoglycemia and diabetic ketoacidosis, reminders that the metabolic consequences can be fatal if not managed.¹⁶ For patients whose pancreas was removed for cancer, the cancer itself is still the primary threat. For those with benign disease, the years of living with brittle diabetes and malabsorption become the long game.

Emerging Technology for Blood Sugar Control

One of the most promising developments for people living without a pancreas is the bihormonal artificial pancreas, a closed-loop system that automatically delivers both insulin and glucagon based on continuous glucose monitor readings. A randomized trial tested this device against standard diabetes care (insulin pumps and pens) in patients who had undergone total pancreatectomy. Over a seven-day period, patients using the bihormonal system spent about 78% of the time in a healthy blood sugar range compared to about 57% with conventional care. Even more striking, time spent in hypoglycemia essentially vanished with the device, dropping to near zero compared to roughly 1.6% of the time with standard treatment.¹⁹

This matters because the absence of glucagon is precisely what makes post-pancreatectomy diabetes so volatile. A system that replaces both missing hormones addresses the core problem in a way that insulin alone never can. These devices are still in clinical trials and not yet widely available, but they represent a potential shift in how manageable life without a pancreas could become in the near future.

Changes to Your Gut Microbiome

Removing a large portion of the pancreas also alters the bacterial community in your gut. A study of infants who had substantial pancreatectomy for congenital hyperinsulinism found that those who lost half or more of their pancreas had significantly less microbial diversity than healthy controls. Beneficial bacteria like Bifidobacteria were less abundant in the group with larger resections.²⁰ While this research is still in its early stages, it raises the question of whether probiotics or dietary interventions aimed at the microbiome could eventually be part of post-pancreatectomy care. The loss of digestive enzymes, changes in gut transit, and the altered nutritional environment in the intestine all create conditions that reshape which bacteria thrive.

The Financial Reality of Lifelong Treatment

Living without a pancreas means lifelong dependence on medications that aren’t cheap. Insulin, enzyme capsules, specialized vitamins, glucose monitoring supplies, and regular blood work add up quickly. A study of Medicare beneficiaries found that nearly 40% of patients took enzyme replacement therapy after pancreatic cancer resection, and those who did faced thousands of dollars in annual out-of-pocket costs for the enzymes alone.²¹ That figure is conservative, since it doesn’t account for insulin, monitoring devices, or the indirect costs of managing a complex chronic condition. For people already dealing with cancer treatment or the aftermath of chronic pancreatitis, the financial strain can become a barrier to taking the very medications they need to stay healthy. The problem isn’t just affordability in the abstract; underdosing of enzyme therapy is common in real-world practice, and cost is one plausible reason patients and clinicians settle for doses that control symptoms but leave nutritional status to deteriorate.⁷

1
PubMed Central. Total Pancreatectomy: Indications, Advantages and Disadvantages – A Review
2
PubMed Central. Total Pancreatectomy with Autologous Islet Cell Transplantation-The Current Indications
3
PubMed Central. Challenges of Managing Type 3c Diabetes in the Context of Pancreatic Resection, Cancer and Trauma
4
PubMed Central. Deficient Glucagon Response to Hypoglycemia During a Mixed Meal in Total Pancreatectomy/Islet Autotransplantation Recipients
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PubMed. Exocrine pancreatic function following pancreatectomy
6
PubMed Central. Pancreatic Enzyme Replacement Therapy: A Concise Review
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PubMed Central. Pancreatic Enzyme Replacement Therapy in Pancreatic Exocrine Insufficiency-Real-World’s Dosing and Effectiveness: A Systematic Review
8
PubMed Central. Nutritional Risks in Patients Undergoing Total Pancreatectomy Islet AutoTransplantation in the POST Consortium
9
PubMed Central. Fat soluble vitamin deficiency is common in children with chronic pancreatitis undergoing TPIAT
10
PubMed Central. Degree of islet function preservation and continuous glucose monitoring in individuals undergoing total pancreatectomy with islet autotransplantation
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PubMed. Total Pancreatectomy With Islet Autotransplantation for Chronic Pancreatitis
12
Diabetes. Effects of Pancreatic Resection on Liver Fat Content and Amino Acid, Lipid, and Glucose Metabolism: A Prospective 1-Year Follow-up Study
13
PubMed Central. De novo non-alcoholic fatty liver disease after pancreatectomy: A systematic review
14
PubMed Central. The impact of splenectomy on outcomes after distal and total pancreatectomy
15
PubMed Central. Patient outcomes after total pancreatectomy: a single centre contemporary experience
16
PubMed Central. Impact of total pancreatectomy: short- and long-term assessment
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PubMed. Perioperative outcomes and long-term quality of life after total pancreatectomy
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PubMed Central. Perioperative Mortality for Pancreatectomy: A National Perspective
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JAMA Surgery. Bihormonal Artificial Pancreas With Closed-Loop Glucose Control vs Current Diabetes Care After Total Pancreatectomy: A Randomized Clinical Trial
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PubMed Central. Gut Microbiome Profile After Pancreatectomy in Infants With Congenital Hyperinsulinism
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PubMed. The Financial Burden of Pancreatic Enzyme Replacement Therapy for Patients With Resected Pancreatic Cancer