What Is Eosinophilic Esophagitis?
Eosinophilic esophagitis, often abbreviated as EoE, is a chronic immune-mediated condition in which eosinophils, a type of white blood cell involved in allergic inflammation, accumulate in the lining of the esophagus. Over time, this inflammation can cause the esophagus to narrow, stiffen, and develop difficulty moving food through normally.
EoE is different from a typical IgE-mediated food allergy. While food triggers are central to the condition, reactions are delayed and driven by a mixed immune response rather than the immediate, IgE-mediated mechanism behind classic food allergy symptoms like hives or anaphylaxis. This is why EoE doesn’t show up reliably on standard allergy blood or skin testing the way a peanut or shellfish allergy would, and why it requires a different diagnostic approach centered on endoscopy and biopsy rather than allergy testing alone.
EoE has become increasingly recognized over the past two decades, both because awareness and diagnostic testing have improved and because rates appear to be genuinely rising. It affects children and adults and is often linked to a personal or family history of other allergic conditions such as asthma, eczema, or environmental allergies, a pattern sometimes called the atopic triad.
What Causes Eosinophilic Esophagitis?
The exact cause of EoE isn’t fully understood, but it’s considered a chronic antigen-driven immune condition, most commonly triggered by specific foods, with environmental allergens playing a secondary role in some individuals.
Common food triggers:
- Milk, the most commonly implicated trigger by a wide margin
- Wheat
- Egg
- Soy
- Peanut and tree nuts
- Fish and shellfish
Milk, wheat, egg, and soy together account for the large majority of identified triggers, which is why elimination diets targeting these foods are a standard starting point in management.
Environmental and other factors:
Seasonal allergens and environmental allergies can contribute to EoE symptom flares in some individuals, though the role is generally considered secondary to food triggers. A personal or family history of asthma, eczema, or environmental allergy is common in people with EoE, reflecting a shared underlying tendency toward allergic and eosinophilic inflammation.
Eosinophilic Esophagitis Symptoms
Symptoms vary significantly by age, which is an important part of recognizing the condition.
In infants and young children:
- Feeding difficulties or refusal
- Poor weight gain or failure to thrive
- Vomiting
- Abdominal pain
In older children:
- Vomiting
- Abdominal pain
- Difficulty swallowing
- Food getting stuck during meals
- Poor appetite
In teens and adults:
- Difficulty swallowing (dysphagia), the most common adult symptom
- Food impaction, food becoming lodged in the esophagus and requiring emergency removal
- Chest pain, often mistaken for heartburn
- Reflux-like symptoms that don’t respond to standard acid-reducing medication
Many adults with EoE unconsciously adapt to swallowing difficulty over years by eating slowly, chewing excessively, avoiding certain textures, or drinking liquids with every bite, without realizing these are compensations for an underlying condition rather than normal eating habits.
Eosinophilic Esophagitis Diagnosis
Clinical history
A detailed history is an important starting point, particularly swallowing difficulty, food impaction episodes, poor response to reflux medication, and any personal or family history of allergic conditions.
Upper endoscopy with biopsy
Diagnosis requires an upper endoscopy, during which a gastroenterologist examines the esophagus and takes tissue biopsies. A diagnosis of EoE is confirmed when biopsies show a significant concentration of eosinophils in the esophageal tissue, along with characteristic changes such as rings, furrows, or narrowing that may be visible during the procedure itself.
Allergy testing
While standard IgE allergy testing does not diagnose EoE, skin prick testing and blood testing are still often used to help identify potential food and environmental triggers and to evaluate for co-existing IgE-mediated allergies, since the two frequently overlap. Atopy patch testing is sometimes used as well, though its predictive value for EoE triggers is limited.
Elimination and reintroduction
Once EoE is diagnosed, an elimination diet followed by structured reintroduction of specific foods, guided by repeat endoscopy and biopsy, is often used to identify which foods are driving inflammation for that individual. This process typically requires close coordination between an allergist and a gastroenterologist.
Eosinophilic Esophagitis Treatment
EoE management usually involves an allergist and a gastroenterologist working together, since the condition sits at the intersection of allergic and digestive disease.
Dietary elimination
Removing identified trigger foods is a cornerstone of treatment. This may involve a targeted elimination based on testing and history, or a broader empiric elimination of the most common triggers (milk, wheat, egg, soy), followed by systematic reintroduction with repeat endoscopy to confirm which foods can be tolerated.
Topical corticosteroids
Swallowed topical corticosteroids, formulated to coat the esophagus rather than act systemically, are a standard first-line medical treatment and can significantly reduce eosinophilic inflammation.
Proton pump inhibitors
Proton pump inhibitors are often trialed as part of the diagnostic and treatment process, since a subset of EoE cases improve with acid suppression alone.
Biologic therapy
Biologic medications targeting the IL-4 and IL-13 inflammatory pathways have been approved specifically for EoE and represent an important option for individuals with inadequate response to dietary and topical steroid treatment.
Esophageal dilation
For individuals who have developed esophageal narrowing or strictures from long-standing inflammation, a procedure to gently widen the esophagus may be needed to relieve swallowing difficulty. This addresses the structural narrowing but does not treat the underlying inflammation, so it’s typically used alongside, not instead of, other treatments.
Because EoE symptoms come from chronic inflammation and swallowing dysfunction rather than an acute IgE-mediated allergic reaction, it is not managed with antihistamines or epinephrine the way food allergy reactions are. If you or your child has trouble swallowing, recurring food impactions, or reflux symptoms that aren’t responding to standard treatment, our allergists can help determine whether EoE is the underlying cause and coordinate care with a gastroenterologist. Book an appointment online or call (212) 686-6321.
Eosinophilic Esophagitis Frequently Asked Questions
Is eosinophilic esophagitis the same as a food allergy?
Not exactly, though food triggers are central to it. Unlike a typical IgE-mediated food allergy, EoE involves a delayed, chronic immune response rather than an immediate reaction, and it doesn’t show up reliably on standard allergy testing. Diagnosis requires endoscopy and biopsy rather than allergy testing alone.
Why does food get stuck in my throat sometimes?
Recurring food impaction, food becoming lodged during swallowing, is one of the more recognizable adult symptoms of EoE and often the reason people are finally evaluated. It happens because chronic inflammation can cause the esophagus to narrow or lose its normal flexibility over time.
Can eosinophilic esophagitis be cured?
There isn’t currently a cure, but EoE is very manageable with the right combination of dietary changes, medication, and monitoring. Many people achieve good long-term control of symptoms and inflammation once an effective treatment plan is identified.
Do I need to see both an allergist and a gastroenterologist?
Usually, yes. EoE sits at the intersection of allergic and digestive disease, and effective management typically requires an allergist to help identify triggers and manage the allergic component, along with a gastroenterologist to perform endoscopy, monitor esophageal healing, and manage any structural complications.
Is eosinophilic esophagitis becoming more common?
Reported rates have risen substantially over the past two decades, due to a combination of increased awareness, more endoscopies being performed, and what appears to be a genuine increase in incidence, similar to trends seen in other allergic conditions.