How Does Celiac Disease Affect the Pancreas?

Celiac disease affects the pancreas in several distinct ways, ranging from reduced digestive enzyme output to an increased risk of pancreatitis and even a modest rise in pancreatic cancer risk. The most common pancreatic problem is exocrine pancreatic insufficiency, where the pancreas does not release enough digestive enzymes into the gut. But celiac disease also shares deep genetic roots with type 1 diabetes, an autoimmune attack on the insulin-producing cells of the pancreas. These connections are more varied and more clinically relevant than many patients realize.

Exocrine Pancreatic Insufficiency in Celiac Disease

The pancreas produces enzymes that break down fats, proteins, and carbohydrates once food leaves the stomach. When this enzyme output drops too low, the result is exocrine pancreatic insufficiency, or EPI. People with EPI often experience fatty stools, bloating, and poor nutrient absorption, symptoms that overlap heavily with celiac disease itself, making the combination easy to miss.

A 2023 systematic review estimated that the overall prevalence of EPI among people with celiac disease is roughly 13.5%, with rates similar in children and adults.¹ Timing matters a great deal. Among people who have just been diagnosed and are not yet on a gluten-free diet, the rate is considerably higher. One meta-analysis found a pooled prevalence of about 26% in newly diagnosed patients, compared with roughly 8% in those already following a gluten-free diet.² That gap is a strong signal that the problem is often reversible, a point worth returning to.

Severe EPI, the kind that causes visible fatty stools, is less common. Across studies using different testing methods, the prevalence of severe EPI ranges from zero to about 18% of celiac patients.³ So while mild enzyme shortfalls are common, most people with celiac disease are not dealing with a pancreas that has stopped functioning.

Why the Pancreas Underperforms

Here is where the mechanism gets interesting: in most celiac patients with EPI, the pancreas itself is structurally fine. The problem lies upstream, in the damaged lining of the small intestine. Celiac disease flattens the villi of the duodenum, and those villi are responsible for releasing hormones called cholecystokinin (CCK) and secretin. These hormones are the signal that tells the pancreas to start secreting enzymes after you eat. When the intestinal lining is damaged, the signal weakens, and the pancreas produces less.⁴

A study that performed endoscopic ultrasound on celiac patients with low enzyme levels found that half had completely normal-looking pancreatic tissue, and none showed the calcification or lobularity typical of chronic pancreatitis. In follow-up, six out of seven patients saw their enzyme levels return to normal.⁵ In other words, the pancreas was never truly damaged in most of these patients. It was just not getting the right instructions.

Additional factors can contribute: malnutrition from poor absorption may leave the pancreas without the raw materials it needs, and dilution of digestive enzymes and bile acids in the inflamed gut can reduce their effectiveness even when they are produced in adequate amounts.³

Recovery on a Gluten-Free Diet

Because the pancreas is usually structurally healthy, EPI in celiac disease tends to resolve once the intestinal lining heals. A gluten-free diet allows the villi to regrow, hormone signaling recovers, and pancreatic enzyme output climbs back to normal. One study of children with celiac disease found that no exocrine pancreatic insufficiency remained in patients whose intestinal mucosa had returned to normal on a gluten-free diet.⁶

This recovery is not always instant. Some patients experience slow resolution of EPI over months, and a minority may continue to have symptoms even after intestinal healing.³ When celiac symptoms persist despite a strict gluten-free diet, doctors sometimes consider whether lingering EPI is to blame. A randomized controlled trial tested pancreatic enzyme supplements in people with non-responsive celiac disease, but the supplements did not produce a significant improvement in gastrointestinal symptoms compared to placebo.⁷ That suggests persistent symptoms in these patients usually have causes beyond enzyme deficiency alone.

Pancreatic insufficiency is considered a more common cause of non-responsive celiac disease in adults than in children, likely because adults tend to have longer-standing intestinal damage before diagnosis and may recover more slowly.⁸

The Pancreatitis Connection

Beyond the quiet underperformance of enzyme output, celiac disease also raises the risk of pancreatitis, the painful inflammation of the pancreas. Multiple large studies have confirmed this, though the size of the risk varies depending on the study design and population.

A Swedish population-based study found that people with celiac disease had roughly triple the risk of developing pancreatitis of any type compared to the general population. The risk for chronic pancreatitis specifically was dramatically higher, nearly 20-fold, though this was based on a small number of cases.⁹ A later study using Swedish registry data estimated the risk at about 2.85 times that of the general population, with an absolute risk of about 126 cases per 100,000 person-years.¹⁰

A recent large matched cohort study found a doubling of risk for acute pancreatitis and a roughly 40% increase for chronic pancreatitis at seven years of follow-up. The risk was elevated across different subtypes, including biliary and idiopathic pancreatitis.¹¹ And a Mendelian randomization study, which uses genetic variants to test for causal relationships, found evidence that celiac disease itself contributes to pancreatitis risk even after accounting for gallstones and elevated triglycerides, two of the most common conventional risk factors.¹²

Why would celiac disease lead to pancreatitis? One proposed explanation involves papillary stenosis, a narrowing of the opening where the pancreatic and bile ducts empty into the duodenum. Chronic inflammation in the duodenum, driven by celiac disease, could inflame and narrow this opening, blocking the normal flow of pancreatic juice and bile.¹³ Researchers studying this connection found active duodenitis and papillitis in celiac patients with pancreaticobiliary problems. Autoimmune-mediated inflammation and malnutrition may also play a role, though the exact contributions of each pathway are still being sorted out.

Celiac Disease, Type 1 Diabetes, and the Endocrine Pancreas

The pancreas has two jobs: producing digestive enzymes (the exocrine function discussed above) and producing hormones like insulin (the endocrine function). Celiac disease connects to the endocrine side through type 1 diabetes, in which the immune system destroys the insulin-producing beta cells of the pancreas. The two conditions share genetic susceptibility, particularly through certain immune-system genes.

The most prominent overlap is in HLA genes, specifically the DQ2 and DQ8 variants, which are strongly associated with both celiac disease and type 1 diabetes.¹⁴ But the connection goes deeper. A large genetic study identified at least seven shared risk regions across the genome, spanning multiple chromosomes and pointing to common biological pathways involving immune regulation and tissue damage.¹⁵ This is why screening for celiac disease is standard practice in people diagnosed with type 1 diabetes, and vice versa.

For people living with both conditions, dietary management gets complicated. The gluten-free diet required for celiac disease adds another layer of restriction on top of carbohydrate management for diabetes. A multicenter analysis found that patients with both type 1 diabetes and celiac disease who achieved celiac-specific antibody negativity (a marker of good gluten-free diet adherence) had lower average blood sugar levels than those who did not achieve antibody negativity. Those who remained antibody-positive had higher blood sugar levels and showed reduced growth in childhood.¹⁶ Good adherence to the gluten-free diet, in other words, seems to help with diabetes control too, probably because patients who follow one treatment plan carefully tend to follow the other as well.

A small randomized trial offered more direct evidence: patients with type 1 diabetes and subclinical celiac disease who were placed on a gluten-free diet saw their average blood sugar marker decline, while those who did not follow the diet saw theirs rise. The gluten-free diet group also had fewer episodes of low blood sugar.¹⁷

Diagnostic Pitfalls

One practical issue clinicians face is that the standard test for exocrine pancreatic insufficiency, the fecal elastase test, can give misleading results in people with intestinal diseases like celiac disease. The test measures a pancreatic enzyme in stool, and it assumes that the enzyme concentration reflects how much the pancreas produced. But in celiac disease, watery diarrhea can dilute the stool sample, and the inflamed intestine may interfere with enzyme recovery, producing a falsely low reading. Studies have found that celiac disease is among the intestinal conditions where fecal elastase results can be abnormally low despite normal pancreatic function.⁵

This means a low fecal elastase result in a newly diagnosed celiac patient does not necessarily mean the pancreas is failing. It may just mean the intestine is too damaged to let the test work properly. Repeating the test after the gut has healed on a gluten-free diet gives a more accurate picture. In the endoscopic ultrasound study cited earlier, the vast majority of patients who initially tested low had normal results on follow-up.

Pancreatic autoantibodies are another area where celiac disease can create confusion. These antibodies, which target pancreatic tissue, have been found in about 22% of celiac patients. That is much higher than the rate in healthy controls but lower than in Crohn’s disease, where they appear in roughly 41% of patients.¹⁸ Their clinical significance in celiac disease is still unclear. They do not appear to cause progressive pancreatic damage in most cases, but their presence underlines the immune system’s broad activation in celiac disease.

Autoimmune Pancreatitis

Given that celiac disease is an autoimmune condition, you might expect it to be linked to autoimmune pancreatitis, a condition in which immune cells attack the pancreas directly. But the evidence suggests this pairing is rare. A study screening 72 patients with autoimmune pancreatitis found only a single case of coexisting celiac disease, and serologic screening of the remaining patients turned up no additional cases.¹⁹ Individual case reports of the combination do exist, but they appear to be coincidental rather than driven by a shared mechanism.²⁰ This is a good reminder that not all autoimmune diseases cluster together. Celiac disease has strong connections to type 1 diabetes and thyroid disease, but autoimmune pancreatitis does not appear to be part of that family.

Pancreatic Cancer Risk

A more unsettling question is whether celiac disease raises the risk of pancreatic cancer. Chronic inflammation and impaired nutrient absorption are both theoretical risk factors, and several observational studies have looked at this directly. A U.S. population-based cohort study found that celiac patients had about a 29% higher risk of pancreatic cancer than matched controls. When the first year after celiac diagnosis was excluded to reduce the chance of detection bias, the risk was even higher, around 56%.²¹

A systematic review and meta-analysis pooling data across multiple studies estimated the overall odds of pancreatic cancer among celiac patients at roughly 1.46 times that of the general population, though there was significant variation between studies.²² To put this in perspective, the absolute risk of pancreatic cancer is low in the general population, and a 30-50% relative increase on a small number still produces a small number. This is not the kind of elevated risk that should cause alarm in any individual patient, but it is worth knowing about, particularly for clinicians managing long-term care.

The reasons behind the association are not fully understood. Chronic low-grade inflammation in the gut, long-term nutrient deficiencies, and the elevated pancreatitis risk described above could all plausibly contribute. Whether strict adherence to a gluten-free diet lowers the cancer risk has not been established, though it would be biologically plausible given that the diet reduces inflammation and improves pancreatic function.

When Persistent Symptoms Need a Second Look

For someone with celiac disease who has been on a strict gluten-free diet for months but still has bloating, fatty stools, or unexplained weight loss, the pancreas deserves attention as a potential contributor. The challenge is distinguishing between ongoing intestinal damage from hidden gluten exposure, unrelated conditions like irritable bowel syndrome or lactose intolerance, and true pancreatic insufficiency that has not yet resolved. Repeat testing of fecal elastase after the gut has had time to heal is a reasonable first step, since an initial low reading at diagnosis may not reflect true pancreatic disease.

If repeat testing still shows low enzyme levels, imaging of the pancreas can help determine whether there is structural damage from pancreatitis or another process. As described earlier, most celiac patients with low enzymes have a structurally normal pancreas on imaging, which is reassuring. Pancreatic enzyme replacement therapy is sometimes tried empirically, but the randomized trial evidence in celiac disease specifically has been disappointing, with no clear symptom improvement over placebo.⁷ This does not mean enzyme supplements are never helpful for an individual patient, but it does mean they are not a reliable fix for persistent celiac symptoms as a group.

The broader picture is that celiac disease’s effects on the pancreas are mostly indirect and mostly reversible. The pancreas is not the primary target of the autoimmune attack, but it gets caught in the crossfire through hormonal disruption, inflammation at the duodenal papilla, and shared genetic susceptibility with type 1 diabetes. For the large majority of celiac patients, healing the intestine with a gluten-free diet is enough to let the pancreas recover its function on its own.

1
PubMed Central. Pancreatic Exocrine Insufficiency Is Not Uncommon in Celiac Disease: A Systematic Review and Meta‐Analysis
2
PubMed. Exocrine Pancreatic Insufficiency Is Common in Celiac Disease: A Systematic Review and Meta-Analysis
3
Pancreapedia: Exocrine Pancreas Knowledge Base. Exocrine Pancreatic Insufficiency and Pancreatitis Associated with Celiac Disease
4
PubMed Central. Pancreatic involvement in celiac disease
5
PubMed Central. Is pancreatic exocrine insufficiency in celiac disease related to structural alterations in pancreatic parenchyma?
6
Gut. Exocrine pancreatic function in children with coeliac disease before and after a gluten free diet
7
PubMed Central. Pancreatic enzyme supplementation versus placebo for improvement of gastrointestinal symptoms in non-responsive celiac disease
8
PubMed. Pediatric and adult celiac disease: similarities and differences
9
Clinical Gastroenterology and Hepatology. Coeliac Disease and Risk of Pancreatitis
10
PubMed Central. Patients with Celiac Disease Have an Increased Risk for Pancreatitis
11
PubMed Central. Risk of incident pancreatitis in patients with celiac disease: A population-based matched retrospective cohort study
12
PubMed Central. Celiac disease as a risk factor for pancreatitis: Evidence from multivariable Mendelian randomization and mediation analysis
13
Gastrointestinal endoscopy. Celiac disease (CD): An etiological factor in papillary stenosis
14
PubMed Central. Association Between Type 1 Diabetes Mellitus and Celiac Disease: Autoimmune Disorders With a Shared Genetic Background
15
PubMed Central. Shared and distinct genetic variants in type 1 diabetes and celiac disease
16
PubMed Central. Lower HbA1c in patients with type 1 diabetes and celiac disease who reached celiac-specific antibody-negativity-A multicenter DPV analysis
17
Endocrine Practice. Effect of Gluten-FREE Diet on Metabolic Control and Anthropometric Parameters in Type 1 Diabetes with Subclinical Celiac Disease: A Randomized Controlled Trial
18
PubMed. Pancreatic autoantibodies are associated with reactivity to microbial antibodies, penetrating disease behavior, perianal disease, and extraintestinal manifestations, but not with NOD2/CARD15 or TLR4 genotype in a Hungarian IBD cohort
19
PubMed Central. There Is No Association between Coeliac Disease and Autoimmune Pancreatitis
20
PubMed. Celiac disease and autoimmune pancreatitis: an uncommon association. A case report
21
PubMed Central. Risk of pancreatic cancer in individuals with celiac disease in the United States: A population-based matched cohort study
22
PubMed Central. Pancreatic Cancer in Celiac Disease Patients—A Systematic Review and Meta-Analysis