What is GERD?
GERD (gastroesophageal reflux disease) is a condition that develops when the reflux of stomach contents causes troublesome symptoms and/or complications that adversely affect an individual's well-being. 1
Core Definition
The internationally accepted Montreal consensus definition frames GERD not simply as the presence of reflux, but specifically as reflux that causes "troublesome" symptoms - meaning symptoms severe or frequent enough to negatively impact quality of life 1. This is a critical distinction: occasional heartburn that doesn't bother you is not GERD, even if reflux is occurring.
Disease Categories
GERD manifests in two main categories 1:
Esophageal syndromes:
- Symptom-based syndromes - troublesome heartburn and regurgitation without visible tissue damage
- Syndromes with esophageal injury - erosive esophagitis, strictures, Barrett's esophagus, and esophageal adenocarcinoma
Extraesophageal syndromes:
- Established associations: chronic cough, laryngitis, asthma, dental erosions
- Proposed associations: pharyngitis, sinusitis, pulmonary fibrosis
Clinical Presentation
The most common symptoms are 2, 3, 4:
- Heartburn - substernal burning sensation in the chest
- Regurgitation - return of gastric contents into the mouth
- Globus sensation (lump in throat)
- Dysphagia (difficulty swallowing)
- Non-cardiac chest pain
- Chronic cough or hoarseness
Epidemiology
GERD is extremely common in industrialized nations 2:
- Nearly 50% of US adults experience monthly symptoms
- Almost 20% have weekly symptoms
- It represents one of the most frequent conditions seen in primary care
Important Distinction: GERD vs. Episodic Heartburn
The key differentiator is the word "troublesome" 1. Infrequent heartburn that doesn't significantly impact your life does not meet the definition of GERD, even if reflux is physiologically present. This threshold is inherently subjective and patient-centered - what's troublesome to one person may not be to another.
Potential Complications
When left untreated, GERD can lead to 2, 3, 4:
- Erosive esophagitis (inflammation and ulceration)
- Esophageal strictures (narrowing)
- Barrett's esophagus (precancerous metaplastic change)
- Esophageal adenocarcinoma (though absolute risk remains low in any individual)
Pathophysiology
GERD results from multiple mechanisms 5, 3:
- Lower esophageal sphincter dysfunction
- Impaired esophageal motility and clearance
- Delayed gastric emptying
- Increased visceral sensitivity to acid exposure