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PubMed This is a summary of 17 peer-reviewed journal articles Updated
Gastroenterology · Erosive Esophagitis

The Biology and Modern Diagnosis of Esophageal Damage

At a Glance

Erosive esophagitis is an inflammatory condition caused by chronic acid reflux. Doctors diagnose it using the Lyon Consensus framework, which relies on endoscopy to find tissue damage (LA Grades B-D) or pH-impedance testing to measure your exact acid exposure time.

For a long time, doctors thought erosive esophagitis (EE) was caused by simple “acid burns” on the surface of the esophagus. Modern research has revealed a more complex biological process: it is actually a cytokine-mediated inflammatory injury [1]. Instead of just burning the surface, chronic acid reflux triggers your esophageal cells to release inflammatory chemicals, which causes the tissue to “reprogram” and break down from the inside out [2][3].

The Balance of Forces

Your esophageal health depends on a constant battle between “aggressive” and “defensive” forces [4].

  • Aggressive Forces: These include stomach acid, pepsin (a digestive enzyme), and sometimes bile. When these stay in the esophagus too long, they overwhelm the tissue [4].
  • Defensive Forces: Your body protects itself with a physical mucosal barrier, bicarbonate in your saliva to neutralize acid, and peristalsis (the muscle contractions that clear acid back down into the stomach) [4][5].

Why Does the Barrier Fail?

Several key risk factors can disrupt this balance and lead to erosions:

  • Hiatal Hernia: This occurs when the top of the stomach slides up into the chest cavity. It is a major risk factor for EE because it physically weakens the valve that keeps acid down [6][7].
  • Visceral Adiposity: Carrying weight specifically around the midsection (visceral fat) is an independent risk factor. This fat increases pressure on the stomach and releases inflammatory signals that further weaken the esophageal lining [8][9].

Modern Diagnosis: The Lyon Consensus 2.0

To ensure patients get the right treatment, doctors now use a standardized international framework called the Lyon Consensus 2.0 [10]. This system moves away from “guessing” based on symptoms and relies on objective testing to confirm a diagnosis.

Finding Type Endoscopy Result (LA Grade) Next Steps
Conclusive GERD Grade B, C, or D No further testing is usually needed; the diagnosis is certain [11].
Inconclusive Grade A or a normal-looking esophagus Requires reflux monitoring (pH-impedance test) to confirm [10][12].
Evidence Against No damage and normal acid levels Symptoms may be due to “functional” issues, not acid reflux [12].

When is More Testing Needed?

While an endoscopy can find physical “mucosal breaks” (erosions), it doesn’t always tell the whole story. If your endoscopy is normal or shows only mild (Grade A) changes, your doctor may recommend Ambulatory pH-Impedance Monitoring (MII-pH) [13].

  1. Measuring AET: This test measures your Acid Exposure Time (AET). If your esophagus is exposed to acid more than 6% of the day, it is considered conclusive GERD [14].
  2. Checking Impedance: Doctors also look at Mean Nocturnal Baseline Impedance (MNBI), which measures how well your esophageal barrier is holding up during the night. A low MNBI score is strong evidence that acid is leaking through and damaging the tissue [15][11].

This objective approach is vital because it distinguishes true erosive disease from Non-Erosive Reflux Disease (NERD) or functional disorders, ensuring you aren’t prescribed intensive treatments unless they are biologically necessary [16][17].

Back to Home

Common questions in this guide

What causes erosive esophagitis?
Erosive esophagitis isn't just a simple acid burn on the surface. It is an inflammatory response where chronic acid reflux causes esophageal cells to release chemicals that break down the tissue from the inside out.
What does an LA Grade B, C, or D mean on my endoscopy?
Under the Lyon Consensus guidelines, finding LA Grade B, C, or D damage during an endoscopy provides a conclusive diagnosis of gastroesophageal reflux disease (GERD). In these cases, no further reflux testing is usually needed.
Why would I need a pH-impedance test if I already had an endoscopy?
If your endoscopy is normal or only shows mild (Grade A) changes, a pH-impedance test can confirm if you have true acid reflux. This test measures your Acid Exposure Time and checks how well your esophageal barrier functions over 24 hours.
How does a hiatal hernia increase my risk for esophageal damage?
A hiatal hernia occurs when the top of your stomach slides into your chest cavity. This physical change weakens the valve that is supposed to keep stomach acid and digestive enzymes from washing back up into your esophagus.
What is Acid Exposure Time (AET)?
Acid Exposure Time (AET) is a measurement of how long your esophagus is exposed to stomach acid during a 24-hour period. If your esophagus is exposed to acid for more than 6% of the day, it is considered a conclusive sign of GERD.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.According to the Lyon Consensus 2.0, was my endoscopy finding (LA Grade A or B) conclusive, or do we need pH-impedance monitoring to confirm GERD?
  2. 2.Did the endoscopy show a hiatal hernia, and how does that affect the 'defensive forces' of my esophagus?
  3. 3.What was my Acid Exposure Time (AET) percentage from the reflux monitoring?
  4. 4.Is my condition primarily driven by acid, or are there other factors like 'visceral adiposity' that we should address?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

Related questions

Can Bile or Non-Acid Reflux Cause Erosive Esophagitis?EoE vs. Erosive Esophagitis: What's the Difference?Could Severe Heartburn With a Normal Endoscopy Be NERD?

References

References (17)
  1. 1

    Association of Acute Gastroesophageal Reflux Disease With Esophageal Histologic Changes.

    Dunbar KB, Agoston AT, Odze RD, et al.

    JAMA 2016; (315(19)):2104-12 doi:10.1001/jama.2016.5657.

    PMID: 27187303
  2. 2

    A new paradigm for GERD pathogenesis. Not acid injury, but cytokine-mediated inflammation driven by HIF-2α: a potential role for targeting HIF-2α to prevent and treat reflux esophagitis.

    Souza RF, Bayeh L, Spechler SJ, et al.

    Current opinion in pharmacology 2017; (37()):93-99 doi:10.1016/j.coph.2017.10.004.

    PMID: 29112883
  3. 3

    Investigation of the mechanism by which miR-223-3p inhibits reflux esophagitis through targeting the NLRP3 inflammasome.

    Lin S, Zheng B, Wu R, et al.

    BMC gastroenterology 2025; (25(1)):365 doi:10.1186/s12876-025-03836-9.

    PMID: 40360974
  4. 4

    Esomeprazole for the Treatment of Erosive Esophagitis in Children: An International, Multicenter, Randomized, Parallel-Group, Double-Blind (for Dose) Study.

    Tolia V, Youssef NN, Gilger MA, et al.

    Journal of pediatric gastroenterology and nutrition 2015; (60 Suppl 1()):S24-30 doi:10.1097/01.mpg.0000469419.29000.94.

    PMID: 26121347
  5. 5

    Novel impedance-pH parameters are associated with proton pump inhibitor response in patients with inconclusive diagnosis of gastro-oesophageal reflux disease according to Lyon Consensus.

    Ribolsi M, Frazzoni M, Marabotto E, et al.

    Alimentary pharmacology & therapeutics 2021; (54(4)):412-418 doi:10.1111/apt.16481.

    PMID: 34181753
  6. 6

    Erosive Esophagitis Unveiled: A Retrospective Study of Epidemiology and Endoscopic Findings in Qassim, Saudi Arabia.

    Albarrak A, Alsamani R, Alwattban RR, et al.

    Cureus 2025; (17(10)):e93688 doi:10.7759/cureus.93688.

    PMID: 41181725
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    Risk factors of erosive esophagitis and barrett's esophagus in patients with reflux symptoms.

    Asreah RH, Abdullhameed A

    Medical journal of the Islamic Republic of Iran 2021; (35()):75 doi:10.47176/mjiri.35.75.

    PMID: 34290999
  8. 8

    Association Between Different Metabolic Obesity Phenotypes and Erosive Esophagitis: A Retrospective Study.

    He T, Sun XY, Tong MH, et al.

    Diabetes, metabolic syndrome and obesity : targets and therapy 2024; (17()):3029-3041 doi:10.2147/DMSO.S471499.

    PMID: 39166154
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    Association of Visceral Fat Area, Smoking, and Alcohol Consumption with Reflux Esophagitis and Barrett's Esophagus in Japan.

    Matsuzaki J, Suzuki H, Kobayakawa M, et al.

    PloS one 2015; (10(7)):e0133865 doi:10.1371/journal.pone.0133865.

    PMID: 26225858
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    Updates to the modern diagnosis of GERD: Lyon consensus 2.0.

    Gyawali CP, Yadlapati R, Fass R, et al.

    Gut 2024; (73(2)):361-371 doi:10.1136/gutjnl-2023-330616.

    PMID: 37734911
  11. 11

    [Modern Diagnostic Strategies for Gastroesophageal Reflux Disease: Focus on Lyon Consensus 2.0].

    Lee TH

    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 2026; (86(3)):193-198 doi:10.4166/kjg.2026.038.

    PMID: 42494146
  12. 12

    Prolonged wireless pH monitoring increases diagnostic yield in patients with reflux symptoms and borderline 24-hour impedance pH.

    Hashimoto H, Piskorz MM, Olmos JI, et al.

    Diseases of the esophagus : official journal of the International Society for Diseases of the Esophagus 2025; (38(2)) doi:10.1093/dote/doaf030.

    PMID: 40285343
  13. 13

    Applying Lyon Consensus criteria in the work-up of patients with proton pump inhibitory-refractory heartburn.

    Frazzoni M, Frazzoni L, Ribolsi M, et al.

    Alimentary pharmacology & therapeutics 2022; (55(11)):1423-1430 doi:10.1111/apt.16838.

    PMID: 35229321
  14. 14

    Can the Mean Nocturnal Baseline Impedance/Acid Exposure Time Ratio Serve as a Novel Parameter for the Definitive Diagnosis of Pathological Reflux?

    Eroğlu Haktanır A, Çelebi A

    Journal of clinical medicine 2025; (14(18)) doi:10.3390/jcm14186586.

    PMID: 41010789
  15. 15

    Mean Nocturnal Baseline Impedance May Be Greater Than 2500 Ohms in Chinese Patients With GERD.

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    Neurogastroenterology and motility 2025; (37(2)):e14986 doi:10.1111/nmo.14986.

    PMID: 39739307
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    Gastroesophageal Reflux Disease and Reflux-like Phenotypes: Using Lyon Consensus 2.0 to Guide Clinical Approach.

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    Journal of neurogastroenterology and motility 2026; (32(3)):326-336 doi:10.5056/jnm26021.

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    The Clinical Spectrum of Gastroesophageal Reflux Disease: Facts and Fictions.

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This page is for informational purposes only and does not replace professional medical advice. Always consult your gastroenterologist to interpret your specific endoscopy or reflux monitoring results.

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