Eosinophilic esophagitis (EoE) has a distinctive appearance when viewed through an endoscope: the esophagus develops concentric rings, vertical grooves, and small white spots that set it apart from other conditions. About 1 in 700 people in the U.S. have EoE, and its visual features are specific enough that gastroenterologists can often suspect the diagnosis before biopsy results come back.
What EoE Looks Like During Endoscopy
The hallmark visual features of EoE fall into five categories, collectively known by the acronym EREFS: edema, rings, exudates, furrows, and strictures. Each one reflects a different stage or aspect of the immune reaction happening inside the esophageal lining.
Rings are concentric, ridge-like circles that wrap around the inside of the esophagus, giving it a corrugated or “ringed” appearance. In mild cases they’re subtle, but in severe cases they can make the esophagus look like a series of stacked rings, sometimes called a “trachealized” esophagus because it resembles the ringed structure of the windpipe. These rings can be fixed (permanent) or transient, appearing and disappearing with muscle contractions.
Furrows are vertical lines or grooves running lengthwise along the esophageal wall. They look like shallow scratches or creases in the tissue and indicate active inflammation and swelling beneath the surface.
Exudates appear as small white spots or plaques scattered across the esophageal lining. These whitish papules correspond to tiny collections of eosinophils (a type of white blood cell) clustered just beneath the surface, forming microabscesses. They can look similar to the white patches caused by a fungal infection, which is why biopsies are important to confirm the diagnosis.
Edema shows up as a loss of the normal vascular pattern. A healthy esophagus has visible, fine blood vessels under its translucent lining. When EoE causes swelling, those vessels disappear and the tissue looks pale, opaque, or waterlogged.
Strictures are areas where the esophagus has narrowed, sometimes affecting just a short segment and sometimes running along the entire length. When the narrowing extends through most of the esophagus, it’s called a “small-caliber esophagus.” In some patients, the tissue is so fragile that it tears just from the passage of the endoscope, a finding called “crepe paper esophagus” because the mucosa shreds like thin paper.
How EoE Differs From Acid Reflux on Scope
EoE and gastroesophageal reflux disease (GERD) can cause overlapping symptoms, but they look quite different during endoscopy. GERD typically causes erosions, raw-looking patches where stomach acid has worn away the lining, particularly near the bottom of the esophagus. In long-standing GERD, the tissue at the lower esophagus may change color and texture, a condition called Barrett’s esophagus. A hiatal hernia is also common.
EoE rarely causes erosions. Instead, the rings, furrows, white exudates, and edema described above are much more characteristic. Seeing erosive damage generally points toward GERD, while seeing a ringed, furrowed esophagus with white spots points toward EoE. When the picture is unclear, biopsy results make the distinction: EoE requires at least 15 eosinophils per high-power field on microscopy, along with elevated mast cell counts and specific gene expression changes in the tissue that don’t occur in GERD.
What EoE Looks Like Under a Microscope
Tissue samples taken during endoscopy are examined for eosinophils, immune cells that are normally rare in the esophagus. The diagnostic threshold is a peak count of at least 15 eosinophils in a single high-power microscope field. Pathologists also look for eosinophils clustering near the surface, forming those microabscesses visible as white spots during endoscopy, and for thickening of the tissue layers beneath the lining. Eosinophil counts tend to be highest in the lower esophagus, even in EoE, which is one reason biopsies are taken from multiple locations along the esophagus rather than just one spot.
What EoE Feels Like in Adults
The visual changes inside the esophagus translate into a predictable set of symptoms. The most common is difficulty swallowing solid foods. Food may feel like it’s sticking in the chest or throat, moving slowly or not at all. When food becomes completely lodged, it’s called a food impaction, and it sometimes requires emergency removal. This is often what first brings adults to a gastroenterologist.
Chest pain is another frequent symptom, typically felt in the center of the chest. Unlike heartburn from acid reflux, it doesn’t improve with antacids. Some people also experience regurgitation of undigested food, which can be mistaken for GERD. Many adults with EoE have unconsciously adapted their eating habits over years, cutting food into tiny pieces, chewing excessively, drinking large amounts of water with meals, or avoiding dense foods like bread and meat, without realizing these behaviors aren’t typical.
How EoE Presents in Children
Children with EoE often look different from adults because their symptoms shift with age. Infants and toddlers tend to have feeding problems, frequent vomiting, and poor weight gain. They may refuse food, gag during meals, or simply fail to grow at the expected rate. School-aged children are more likely to report vomiting and abdominal pain. By the teenage years, symptoms start resembling the adult pattern, with solid food getting stuck in the throat or chest becoming the primary complaint, especially during meals with dense textures.
Because younger children can’t easily describe the sensation of food sticking, EoE in this age group is more likely to be missed or attributed to picky eating, reflux, or behavioral feeding issues. The delay between symptom onset and diagnosis can be years, during which ongoing inflammation may lead to the strictures and tissue remodeling visible on later endoscopy.
How Severity Is Graded
Gastroenterologists use the EREFS scoring system to standardize how they describe and track EoE’s appearance over time. Each of the five features is graded on a scale. Edema is scored as absent or present. Rings are graded from absent to severe. Exudates range from absent to severe. Furrows are scored as absent or present. Strictures are recorded as absent or present, with the estimated diameter and location noted. The total score ranges from 0 to 8 points.
This scoring system serves a practical purpose: it lets doctors compare how the esophagus looks before and after treatment. A dropping EREFS score means the visible inflammation is improving, even if symptoms haven’t fully resolved yet. It also works in reverse. Some patients feel better but still show significant inflammation on scope, which matters because untreated inflammation can progress to permanent narrowing and fibrosis over time.