Gastroesophageal Reflux Disease Risk Factors and Pathophysiology

Introduction to GERD Risk Factors

Gastroesophageal reflux is the greatest risk factor for developing GERD and its complications, with an odds ratio of 12.0 (95% CI 7.64-18.7) for Barrett's esophagus and 4.64 (95% CI 3.28-6.57) for esophageal adenocarcinoma, according to the American Gastroenterological Association 1
The American College of Gastroenterology recommends considering gastroesophageal reflux as the primary risk factor for GERD, characterized by transient relaxations of the lower esophageal sphincter that permit gastric contents to enter the esophagus 1

Male gender is associated with a significantly higher risk of GERD complications, such as Barrett's esophagus, with a male:female incidence of 7:1, as reported by the American College of Gastroenterology 1, 2
Older age, particularly >60 years, is a risk factor for GERD, with an odds ratio of 1.81 (95% CI 1.07 to 3.09) compared to <40 years, according to the American Gastroenterological Association 2
Long duration of reflux symptoms, longer than 5 years, increases the risk of GERD (OR 4.2; 95% CI 1.2 to 4.8), as stated by the American College of Gastroenterology 2
Smoking is a moderate established risk factor for GERD, particularly for complications, according to the American Heart Association 1, 2
Ethnicity plays a role in GERD prevalence, with higher rates in Western populations (10-20%) compared to Eastern Asia (8.5%), as reported by the American Gastroenterological Association 3, 4

Esophageal atresia (repaired) increases the risk of severe, chronic GERD, according to the American Academy of Pediatrics 3
Achalasia is listed as a high-risk condition for GERD, as stated by the American Gastroenterological Association 3
Hereditary component contributes up to one-third of the risk for sporadic Barrett's esophagus and esophageal adenocarcinoma, according to the American College of Gastroenterology 1
Familial aggregation is observed in approximately 7% of cases of Barrett's esophagus and esophageal adenocarcinoma, as reported by the American Gastroenterological Association 1, 2

Transient relaxations of the lower esophageal sphincter independent of swallowing contribute to GERD, according to the American Academy of Pediatrics 3
Exposure of esophageal mucosa to reflux of acid and bile leads to injury and DNA damage, as stated by the American College of Gastroenterology 1
Injury due to reactive oxygen species and nitric oxide production leads to DNA damage, according to the American Gastroenterological Association 1

Smoking cessation can reduce the risk of GERD, particularly for squamous cell carcinoma, as recommended by the American Cancer Society 5
The relationship between GERD and obesity is bidirectional, with obesity increasing reflux through elevated intra-abdominal pressure, and the obesity-related metabolic syndrome being a risk factor for Barrett's esophagus, independent of reflux symptoms, according to the American Gastroenterological Association 1
GERD symptoms in infants often resolve with maturation and don't always respond to acid-suppression therapy, as stated by the American Academy of Pediatrics 4