What is Epigastric Pain Syndrome (EPS)?
Epigastric pain syndrome is a subtype of functional dyspepsia characterized by bothersome epigastric pain or burning occurring at least 1 day per week, with symptoms present regardless of meal timing, though meals may induce or relieve the discomfort. 1, 2
Diagnostic Criteria
EPS requires one or both of the following symptoms occurring at least 1 day per week: 1, 2
- Bothersome epigastric pain (severe enough to impact usual activities)
- Bothersome epigastric burning (severe enough to impact usual activities)
The Rome IV research criteria mandate symptom onset at least 6 months prior to diagnosis with active symptoms in the past 3 months, though clinical practice criteria allow diagnosis after 8 weeks of cardinal symptoms to facilitate earlier treatment. 2
Key Distinguishing Features from Postprandial Distress Syndrome (PDS)
The critical distinction is that EPS symptoms occur independent of meal timing, whereas PDS is defined by meal-triggered symptoms (postprandial fullness and early satiation occurring ≥3 days per week). 1, 2 However, recent evidence challenges this traditional meal-unrelated characterization—approximately 40% of EPS patients actually experience postprandial epigastric pain without meeting PDS criteria, representing a newly recognized "postprandial EPS" phenotype. 3
Associated Features
EPS may coexist with: 1
- Postprandial epigastric bloating
- Belching
- Nausea (though persistent vomiting suggests alternative diagnoses)
- Pain that may be induced by meals, relieved by meals, or occur while fasting
Overlap and Clinical Reality
Substantial overlap exists between EPS and PDS, with 66% of functional dyspepsia patients meeting criteria for both subtypes in primary care settings 4, and approximately one-third showing overlap in tertiary referral centers. 2 Patients with overlapping symptoms tend to have more severe presentations and greater burden of associated gastrointestinal symptoms. 3, 5
Essential Exclusions
EPS is a diagnosis of exclusion requiring: 1, 2
- Upper endoscopy showing no structural disease explaining symptoms
- Helicobacter pylori testing (all dyspepsia patients should be tested; functional dyspepsia should only be diagnosed after persistent symptoms following successful eradication) 2
- Exclusion of GERD (predominant heartburn ≥once weekly suggests GERD rather than dyspepsia) 2
- Pain does not fulfill biliary pain criteria 1
- Symptoms not relieved by evacuation of feces or gas 1
Pathophysiology Context
EPS represents approximately 20-30% of functional dyspepsia cases when classified as "pure" EPS without PDS overlap, though this proportion varies based on how strictly meal relationships are defined. 4, 5 The condition does not equate with absence of pathology—duodenal eosinophilia is an accepted association, and H. pylori infection is causally linked in subsets. 6
Clinical Pitfalls
Common diagnostic errors include: 1, 2
- Misclassifying heartburn as dyspeptic pain (heartburn is not a dyspeptic symptom but may coexist)
- Failing to recognize that EPS and gastroparesis are symptom-based constructs with significant overlap that cannot be distinguished by symptoms or gastric emptying studies alone
- Delaying endoscopy in patients ≥55 years with dyspepsia accompanied by nausea/vomiting (non-urgent endoscopy indicated even without other alarm features) 2