In this episode of Hospital Medicine Unplugged, we break down celiac disease—from epidemiology and modern diagnostic strategies to life-threatening complications and emerging therapies beyond the gluten-free diet.

We start with epidemiology clinicians should know. The global prevalence of celiac disease is ~1.4% based on serology and ~0.7% with biopsy confirmation. Incidence rates are ~17 per 100,000 person-years in women and ~8 per 100,000 in men, with a female-to-male ratio of ~1.8. Importantly, about 70% of cases remain undiagnosed, the so-called “celiac iceberg.” Over recent decades, incidence has increased substantially, rising from <2 per 100,000 annually in the 1980s to >20 per 100,000 in many regions today.

Next we unpack genetic susceptibility and immune pathogenesis. Nearly all patients carry HLA-DQ2 or HLA-DQ8, but these genes alone are insufficient—~40% of the population carries them, yet only 1–3% develop disease, highlighting the role of environmental triggers and additional genetic factors. Gluten exposure leads to immune activation against deamidated gliadin peptides, resulting in small-intestinal inflammation, villous atrophy, and malabsorption.

We then highlight how the clinical presentation has shifted. The classic picture of malabsorption with diarrhea and weight loss is now less common in adults. Instead, non-classical presentations predominate, including iron-deficiency anemia, osteoporosis, abnormal liver enzymes, infertility, and nonspecific GI symptoms. Diarrhea still occurs in ~40–50% of patients, but many adults present with extraintestinal manifestations or even asymptomatic disease.

We also review celiac crisis, a rare but life-threatening presentation requiring hospitalization. Patients develop severe diarrhea, dehydration, electrolyte disturbances, metabolic acidosis, and profound malnutrition. Management requires intravenous fluids, electrolyte replacement, aggressive nutritional support, and sometimes corticosteroids, alongside initiation of a strict gluten-free diet, which leads to improvement in the vast majority of patients.

Diagnosis begins with serologic testing. IgA tissue transglutaminase (tTG-IgA) is the preferred initial screening test, with ~93–95% sensitivity and ~95–98% specificity, and total IgA should be measured simultaneously to detect IgA deficiency. Endomysial antibody testing has near-100% specificity and can confirm the diagnosis. In adults, upper endoscopy with small-bowel biopsy remains the diagnostic standard, demonstrating intraepithelial lymphocytosis, crypt hyperplasia, and villous atrophy.

We then discuss major complications clinicians must recognize. These include osteoporosis, infertility, neurologic complications, hyposplenism, and small-bowel adenocarcinoma. One of the most serious is enteropathy-associated T-cell lymphoma (EATL)—a rare but aggressive malignancy with very poor survival, often arising from type 2 refractory celiac disease.

Refractory celiac disease (RCD) occurs when symptoms and villous atrophy persist despite ≥12 months of strict gluten-free diet. • Type 1 RCD behaves similarly to active celiac disease and responds to immunosuppressive therapy with excellent survival. • Type 2 RCD represents a pre-lymphoma state with clonal abnormal lymphocytes, and 30–50% progress to EATL within five years.

Management still centers on the gluten-free diet, which leads to symptomatic improvement in ~70% of patients within two weeks, though histologic healing can take months and may remain incomplete in many adults.

Finally, we explore the future of therapy. While diet remains the cornerstone, multiple pharmacologic strategies are in development, including gluten-degrading enzymes, intestinal barrier modulators like larazotide, transglutaminase inhibitors, immune-modulating therapies targeting IL-15, microbiome-based therapies, and even gene-edited wheat with reduced immunogenic gluten.

The takeaway: celiac disease is common, frequently underdiagnosed, and increasingly recognized through non-classical presentations. With improved diagnostics, recognition of severe complications like refractory disease and lymphoma, and a rapidly evolving therapeutic pipeline, management of celiac disease is entering a new era beyond diet alone.