• Disorder in which gastric contents recurrently reflux into the esophagus, causing troublesome symptoms and/or complications, eg injury of the esophageal mucosa and adjacent structures
  • Symptoms become “troublesome” when they adversely affect a patient’s well-being - moderate to severe symptoms occurring on >1 days/week 

• Produced by various mechanisms such as frequent occurrence of transient relaxation of the lower esophageal sphincter (LES), pressure abnormalities in the lower esophageal sphincter (which can be caused by hormonal and neural mediators, food, drugs and patient lifestyle)
  • Other factors in the pathology of GERD include poor esophageal clearance, delayed gastric emptying time, hiatal hernia

• Typical symptoms are acid regurgitation and heartburn
  • Regurgitation is the perception of flow of refluxed gastric contents into the mouth or hypopharynx
  • Heartburn is defined as a burning sensation in the retrosternal region

• Other presenting symptoms include, nausea, chest pain, epigastric pain, belching, early satiety, bloating
  • Non-cardiac chest pain (NCCP) is common among Asian patients and may be a presenting feature of GERD

Risk Factors Linked to GERD

• Age and male sex - associated with a higher incidence of esophagitis
• Obesity - 2.5x more likely to have GERD than those with normal BMI; overweight and obesity contribute to the increasing prevalence of GERD in the Asia-Pacific region
• Alcohol
• Smoking
• Hiatus hernia - presence and size of a hiatal hernia are associated with a more incompetent LES, defective peristalsis, increased acid exposure and more severe mucosal damage

Precipitating Factors Linked to GERD

• Coffee, chocolate, fatty foods
• Acidic foods (eg spicy foods, citrus, carbonated drinks)