Eosinophilic esophagitis (EoE) is a chronic immune-driven disease in which a type of white blood cell called an eosinophil builds up in the lining of the esophagus, causing inflammation, swelling, and, over time, scarring that can make swallowing difficult or painful. Once considered rare, EoE has become one of the most common causes of swallowing difficulty and food impaction in children and younger adults, with its global prevalence climbing roughly ninefold between the late 1970s and the early 2020s. The condition sits at the intersection of allergy, gastroenterology, and immunology, and managing it well usually means navigating some combination of dietary changes, medications, and endoscopic monitoring.
How EoE Develops
EoE is fundamentally an allergic disease of the esophagus. When a susceptible person is exposed to certain food proteins or airborne allergens, the immune system mounts a specific type of inflammatory response. Immune cells release signaling molecules, particularly interleukin-13 (IL-13), that recruit eosinophils into the esophageal tissue and alter the protective barrier that lines the esophagus.1PubMed Central. Examining the Role of Type 2 Inflammation in Eosinophilic Esophagitis IL-13 appears to be the dominant driver. Research measuring gene activity in esophageal tissue found IL-13 levels roughly 16 times higher in people with EoE than in healthy controls, and IL-13 levels correlated with the production of eotaxin-3, the protein that directly summons eosinophils to the esophagus.2Journal of Allergy and Clinical Immunology. IL-13 is involved in eosinophilic esophagitis and induces eotaxin-3 by encoding signal transducer and activator of transcription 6 in epithelial cells
Once eosinophils accumulate, the damage compounds. They release toxic proteins that erode the esophageal lining, and IL-13 itself weakens the tissue’s structural integrity. Genetic studies have identified a gene called CAPN14, which encodes an enzyme activated more than a hundredfold by IL-13 in esophageal cells. When this enzyme is overactive, it disrupts the physical connections between cells in the esophageal lining, contributing to the “leaky” barrier that lets more allergens penetrate and more inflammation take hold.3The Journal of Clinical Investigation. Eosinophilic esophagitis–linked calpain 14 is an IL-13–induced protease that mediates esophageal epithelial barrier impairment This creates a self-reinforcing loop: barrier damage lets more allergens in, which triggers more inflammation, which damages the barrier further.
Symptoms in Children and Adults
EoE looks different depending on your age, partly because the disease changes the esophagus over time. Young children tend to present with feeding difficulty, vomiting, abdominal pain, and poor weight gain. They often cannot articulate that food is getting stuck, so parents and pediatricians may initially attribute the symptoms to reflux or picky eating. Adolescents and adults, by contrast, overwhelmingly report difficulty swallowing solid foods and episodes of food getting lodged in the esophagus, sometimes requiring emergency removal. These differences reflect the progressive nature of the disease: years of unchecked inflammation lead to scarring and narrowing of the esophagus, and the consequences of that remodeling become more apparent with age.4PubMed. Adult versus pediatric eosinophilic esophagitis: important differences and similarities for the clinician to understand
Many adults with EoE develop subtle compensatory behaviors without realizing it. They chew food excessively, take tiny bites, avoid certain textures like bread and meat, drink copious amounts of liquid with meals, and eat slowly. These adaptations can mask the severity of the disease for years before a food impaction episode finally prompts medical attention.
Who Gets EoE
EoE occurs more often in males, in high-income countries, and especially in North America and Europe. A systematic review spanning data from 1976 to 2022 estimated that the global prevalence rose from about 8 cases per 100,000 people in the early decades to roughly 74 per 100,000 in the most recent period.5Clinical Gastroenterology and Hepatology. Global Trends in the Incidence and Prevalence of Eosinophilic Esophagitis, 1976–2022: A Systematic Review and Meta-Analysis Whether this dramatic climb reflects a true increase or better recognition and more widespread use of endoscopy is debated, though most experts believe both factors are at play.
Race and ethnicity matter. In a Southern California study, Hispanic and Black patients had substantially lower odds of being diagnosed with EoE compared with White patients, even after accounting for the clinical setting and language barriers.6PubMed Central. Prevalence of Eosinophilic Esophagitis Among Ethnic Groups in a Private Vs a Safety Net-Hospital in Southern California Importantly, when non-White patients are diagnosed, their clinical picture can differ. A large cohort study found that non-White EoE patients were younger at diagnosis, had more vomiting and less of the classic swallowing-difficulty presentation, and showed fewer of the typical endoscopic features. They also responded less well to topical steroid therapy, with a histologic response rate of about 41% compared with 59% in White patients.7PubMed Central. Clinical features and treatment response to topical steroids in ethnic and racial minority patients with eosinophilic esophagitis These disparities are not well understood and may involve genetic differences, underdiagnosis, or variations in allergen exposure and diet.
Environmental and Early-Life Risk Factors
The rapid rise in EoE cases over just a few decades suggests that genes alone do not explain the disease; something in the environment has changed. Researchers have identified several early-life exposures associated with higher risk, including antibiotic use in infancy, early acid-suppression therapy, and delivery by cesarean section.8PubMed Central. Environmental factors and eosinophilic esophagitis All of these factors share a common thread: they alter the developing microbiome, the community of bacteria living in and on the body.
The hypothesis is consistent with the broader “hygiene” framework seen in other allergic diseases. Reduced exposure to diverse microbes early in life may bias the immune system toward allergic-type responses. The esophagus has its own microbiome, and inflammation appears to shift its bacterial composition in ways that may perpetuate the disease cycle.9Clinical reviews in allergy & immunology. The Role of the Environment in Eosinophilic Esophagitis Still, no single environmental factor has been proven to directly cause EoE, so these associations remain just that for now.
The Connection to Other Allergic Diseases
EoE rarely travels alone. The majority of people with EoE also have at least one other allergic condition, and the overlap is striking. A meta-analysis found that compared with people without EoE, those with the disease were about five times more likely to have allergic rhinitis (hay fever), three times more likely to have asthma, and roughly three times more likely to have eczema.10PubMed. Association between atopic manifestations and eosinophilic esophagitis: A systematic review and meta-analysis Food allergies are also common. In practical terms, if you or your child is being evaluated for EoE, expect the gastroenterologist to ask detailed questions about allergies and possibly coordinate with an allergist.
Seasonal allergens may also affect EoE activity. Some patients notice worsening symptoms during pollen season, and there is evidence that airborne allergens can trigger or exacerbate esophageal eosinophilia independently of food triggers. This does not mean everyone with spring allergies needs to worry about EoE, but for those who already have the disease, pollen exposure can be one more variable complicating management.
How EoE Is Diagnosed
Diagnosing EoE requires three things: symptoms pointing to esophageal trouble, a biopsy showing at least 15 eosinophils per high-power microscope field in the esophageal tissue, and exclusion of other conditions that could cause eosinophils to accumulate there.11PubMed Central. Eosinophilic esophagitis: diagnostic tests and criteria That 15-eosinophil threshold has become the standard benchmark, and studies show pathologists can identify it with high reliability.12PubMed Central. Determination of esophageal eosinophil counts and other histologic features of eosinophilic esophagitis by pathology trainees is highly accurate
Beyond counting eosinophils, endoscopists look at the esophagus itself. Common visual findings include rings (the “trachealized” or feline esophagus), white plaques that represent eosinophil collections, linear furrows or grooves running along the length of the esophagus, and narrowing. A validated scoring system known as EREFS captures these features, and studies have found that detecting more than one visual abnormality during endoscopy can identify EoE with roughly 90% sensitivity and 88% specificity in children.13PubMed Central. Eosinophilic Esophagitis Reference Score Accurately Identifies Disease Activity and Treatment Effects in Children
The endoscopy-plus-biopsy approach is accurate but burdensome. People with EoE typically need repeated endoscopies to check whether treatment is working, and each one involves sedation and a day off work or school. That burden has driven interest in less-invasive alternatives.
Less-Invasive Monitoring on the Horizon
One of the more promising tools is the Cytosponge, a small capsule on a string that the patient swallows. Once the capsule dissolves, it expands into a small sponge that collects tissue from the esophageal lining as it is withdrawn. In early studies, the device detected active EoE with about 85% sensitivity, every patient successfully swallowed it, and every patient who tried it said they would prefer it over endoscopy for future monitoring.14Clinical Gastroenterology and Hepatology. Accuracy, Safety, and Tolerability of Tissue Collection by Cytosponge vs Endoscopy for Evaluation of Eosinophilic Esophagitis The specificity was lower, around 56%, partly because the sponge sometimes picked up eosinophils that biopsies missed, raising the question of whether the sponge was overcalling disease or the biopsies were undercalling it.15PubMed Central. Non-Invasive Tests for Eosinophilic Esophagitis: Ready for Use?
Researchers are also exploring blood and urine markers, including proteins released by eosinophils and eotaxin-3. Advanced imaging techniques that can examine the esophageal wall in real time during endoscopy are being studied as well.16PubMed Central. Advances in diagnostic techniques for eosinophilic esophagitis: a systematic review of emerging noninvasive methods None of these tools has replaced endoscopy in routine care yet, but they point toward a future where disease monitoring is far less disruptive for patients.
Dietary Treatment
Because food allergens are the most common triggers for EoE, elimination diets have been a cornerstone of treatment since the disease was first described. The idea is straightforward: remove the food or foods driving inflammation, and the esophagus heals. The challenge is figuring out which food is the culprit. Across all types of elimination diets studied, the overall rate of histologic improvement is around 54%.17Clinical Gastroenterology and Hepatology. Efficacy of Elimination Diets in Eosinophilic Esophagitis: A Systematic Review and Meta-analysis
The traditional approach removed the six most common allergenic food groups: milk, wheat, egg, soy, nuts/tree nuts, and fish/shellfish. A landmark randomized trial tested whether simply removing dairy alone (a one-food elimination diet) would work nearly as well. It found that about a third of patients achieved remission on the dairy-only diet compared with 40% on the six-food diet, a difference that was not statistically meaningful.18PubMed Central. One Food versus Six Food Elimination Diet Therapy for Treatment of Eosinophilic Esophagitis: A Multicenter Randomized Clinical Trial This result has shifted clinical practice. Many gastroenterologists now start with dairy removal as a first step because it is far easier for patients to maintain and catches the most common single trigger. If dairy elimination alone does not resolve the eosinophilia, additional foods can be removed in a stepwise fashion.
Elimination diets work, but they come with real downsides. They require repeated endoscopies to test whether each elimination step has been effective. They can be socially isolating, nutritionally limiting (especially for children), and mentally exhausting. For some patients, the dietary route is empowering. For others, the restrictions feel worse than the disease.
Medications
Proton pump inhibitors (PPIs), the same acid-reducing drugs used for reflux, are often the first medication tried. A substantial portion of EoE patients respond to PPIs, not necessarily because acid is the primary problem but because PPIs appear to have separate anti-inflammatory effects and may help restore esophageal barrier function.19PubMed Central. Proton pump inhibitor-responsive oesophageal eosinophilia and eosinophilic oesophagitis: more similarities than differences Older diagnostic criteria used to exclude PPI-responsive patients from the EoE diagnosis entirely, but guidelines have evolved. PPI responders are now considered part of the EoE spectrum.
When PPIs are insufficient, swallowed topical corticosteroids are the next step. Patients swallow inhaler-type medications, typically budesonide or fluticasone, so that the steroid coats the esophagus rather than reaching the lungs. Most formulations have been used off-label, adapted from asthma inhalers, though an esophagus-specific budesonide tablet was approved in Europe in 2018 and has shown response rates up to 85%.20PubMed Central. Treatment of eosinophlic esophagitis with swallowed topical corticosteroids In children who do not respond to PPIs, swallowed topical steroids achieve symptomatic remission in about 71% and histologic remission in about 59%.21PubMed Central. Swallowed topical steroid therapy for eosinophilic oesophagitis in children: practical, evidence-based guidance by the BSPGHAN Eosinophilic Oesophagitis Working Group Because the steroids act locally rather than systemically, the side-effect profile is generally mild, though esophageal fungal infections (candidiasis) can occur.
Dupilumab and the Biologic Era
The biggest recent advance in EoE treatment is dupilumab, a biologic drug that blocks the signaling of IL-4 and IL-13, the key immune molecules driving the disease. In 2022, a pivotal trial demonstrated that about 60% of adults and adolescents receiving weekly dupilumab injections achieved histologic remission, compared with roughly 5% on placebo.22PubMed. Dupilumab in Adults and Adolescents with Eosinophilic Esophagitis That is a striking gap, and it validated decades of research pointing to IL-13 as the central driver of the disease.
Longer-term data are encouraging as well. In an extension study following patients for a full year, about 85% of those on continuous weekly dupilumab maintained eosinophil counts at or below disease-inactive levels, and peak eosinophil counts dropped by more than 95% from baseline. Improvements in tissue damage, endoscopic findings, and swallowing symptoms all held or continued to improve over 52 weeks.23PubMed. Efficacy and safety of dupilumab up to 52 weeks in adults and adolescents with eosinophilic oesophagitis (LIBERTY EoE TREET study): a multicentre, double-blind, randomised, placebo-controlled, phase 3 trial Dupilumab is now approved for EoE in the United States and Europe, making it the first biologic approved for the disease. The main limitations are cost and the need for ongoing injections, which keep it positioned as an option for patients who do not respond to or cannot tolerate other treatments.
Esophageal Dilation
For patients whose esophagus has already narrowed from years of scarring, dilation is an important tool. During an endoscopy, the doctor gradually stretches the esophagus using a balloon or a tapered dilator. A large study found this procedure was well tolerated, with no perforations or major bleeding events; the main complication was temporary chest pain, occurring in about 5% of cases.24PubMed Central. Outcomes of esophageal dilation in eosinophilic esophagitis: Safety, efficacy, and persistence of the fibrostenotic phenotype Symptom improvement rates run around 83%.25PubMed. Esophageal dilation in eosinophilic esophagitis: safety and predictors of clinical response and complications
The catch is that dilation addresses the mechanical consequence of the disease, the narrowing, without treating the underlying inflammation. More than half of dilated patients needed a second procedure, most within the first year.26PubMed Central. Outcomes of esophageal dilation in eosinophilic esophagitis: Safety, efficacy, and persistence of the fibrostenotic phenotype In patients with severe strictures, achieving histologic remission through anti-inflammatory therapy was strongly associated with reaching a healthy esophageal diameter, reinforcing the idea that dilation works best when paired with active disease control.27PubMed. Clinical outcomes of adults with eosinophilic esophagitis with severe stricture
What Happens Without Treatment
EoE does not resolve on its own, and the consequences of ignoring it compound over time. The natural history of untreated disease is a shift from predominantly inflammatory features toward fibrostenotic disease, meaning the esophagus becomes increasingly stiff and narrow.28PubMed Central. Clinical Implications and Pathogenesis of Esophageal Remodeling in Eosinophilic Esophagitis A large cohort study estimated that for every additional year of undiagnosed EoE, the risk of having a stricture increased by 9%.29PubMed. The natural course of eosinophilic esophagitis and long-term consequences of undiagnosed disease in a large cohort This progressive remodeling partly explains why many adults present with strictures at diagnosis: they have likely had subclinical disease for years.
EoE is not known to increase the risk of esophageal cancer, which is a common concern patients raise. However, the chronic inflammation does diminish the esophageal barrier and damages mucosal tissue over time.30PubMed Central. Eosinophilic Esophagitis: A Review The most realistic long-term threat is progressive narrowing that makes eating increasingly difficult, necessitates emergency food-disimpaction procedures, and gradually erodes quality of life.
The Psychological and Financial Weight
Living with EoE takes a toll that goes beyond swallowing difficulty. Both children and adults with the disease are at elevated risk for anxiety and depression, driven by the disease itself and by the dietary treatments it demands.31PubMed Central. Anxiety and Depression in Eosinophilic Esophagitis: A Scoping Review and Recommendations for Future Research In a study of adult patients, the domains most affected were disease-related anxiety and eating and diet impact. Women reported significantly worse quality of life than men across multiple dimensions, and having daily swallowing symptoms, active food impaction episodes, or ongoing dietary restrictions independently worsened outcomes.32Journal of Neurogastroenterology and Motility. General Well-being and Coping Strategies in Adult Eosinophilic Esophagitis Patients
The financial burden is substantial as well. Annual health-care costs for people with EoE run about two and a half times higher than for matched controls, driven by more prescriptions, more outpatient visits, and the endoscopies required for monitoring. For those who need esophageal dilation, costs climb further still.33Journal of Clinical Gastroenterology. Economic Burden and Health Care Resource Utilization of Patients With Eosinophilic Esophagitis in the United States The cumulative financial and emotional cost helps explain why less-invasive monitoring tools and therapies that reduce the need for repeated endoscopies are such high priorities for researchers and patients alike.
Why EoE Is Often Diagnosed Late
Despite growing awareness, a significant diagnostic delay remains common. Many patients spend years seeing doctors for what they assume is reflux or anxiety around eating. Adults may not realize that needing 20 minutes to finish a sandwich is abnormal. Children may be labeled as problem eaters. The average time from symptom onset to diagnosis varies widely across studies, but delays of several years are the norm rather than the exception.
Several factors drive late diagnosis. EoE symptoms overlap with gastroesophageal reflux disease, and a normal-looking esophagus on endoscopy does not rule out EoE because biopsies are necessary to see the eosinophils. Some endoscopists may not biopsy if the esophagus looks visually unremarkable. People who have adapted their eating habits may not mention swallowing trouble because they have normalized it. And in populations where EoE is less common or less well studied, clinicians may simply not think of it. All of this underscores the importance of biopsying the esophagus in anyone with unexplained swallowing symptoms, even when the visual appearance seems benign.