What are the classifications of dyspepsia?

Dyspepsia Classification

Dyspepsia is classified into two main categories: organic dyspepsia (caused by identifiable structural or biochemical abnormalities) and functional dyspepsia (FD), which is further subdivided into two distinct subtypes based on the Rome IV criteria—Postprandial Distress Syndrome (PDS) and Epigastric Pain Syndrome (EPS). 1

Primary Classification Framework

Organic vs. Functional Dyspepsia

• Organic dyspepsia accounts for approximately 20% of cases and includes peptic ulcer disease (~10%), gastroesophageal reflux disease (GERD), gastric or esophageal cancer, pancreatic or biliary disorders, and medication-related causes (particularly NSAIDs). 1, 2

• Functional dyspepsia represents approximately 80% of patients with dyspepsia who undergo endoscopy and have no structural abnormality identified to explain their symptoms. 1

Functional Dyspepsia Subtypes (Rome IV Criteria)

Functional dyspepsia is classified into two distinct subtypes based on predominant symptom patterns: 1

1. Epigastric Pain Syndrome (EPS)

• Defining symptoms: Bothersome epigastric pain or burning occurring at least 1 day per week 1
• Characteristics: Pain or burning present regardless of meals, though may be induced or relieved by food intake 1
• Associated features: Postprandial epigastric bloating, belching, and nausea may coexist 1

2. Postprandial Distress Syndrome (PDS)

• Defining symptoms: Bothersome postprandial fullness and/or early satiation occurring at least 3 days per week 1
• Characteristics: Symptoms predominantly triggered by meals; early satiation severe enough to prevent finishing a regular-sized meal 1
• Associated features: Postprandial epigastric pain or burning, bloating, excessive belching, and nausea 1

Important Clinical Considerations

Symptom Duration Requirements

The Rome Foundation has developed two sets of criteria to address practical limitations: 1

• Rome IV research criteria: Require symptom onset at least 6 months prior to diagnosis with symptoms active in the past 3 months 1
• Clinical criteria for practice: Require cardinal symptoms present for only 8 weeks, making diagnosis more practical and avoiding treatment delays 1

Overlap Between Subtypes

• Overlap of EPS and PDS occurs in up to one-third of patients in referral populations, particularly in secondary and tertiary care settings 1
• Patients with overlapping features have more severe symptoms and may require different management approaches 3

Exclusion Criteria

The following features exclude a diagnosis of dyspepsia or suggest alternative diagnoses: 1

• Predominant heartburn (occurring more than once weekly) suggests GERD rather than dyspepsia 1
• Persistent vomiting warrants consideration of another disorder such as gastroparesis 1
• Symptoms relieved by evacuation of feces or gas should not be considered dyspeptic symptoms 1

Differential Diagnosis Categories

Key Organic Causes to Exclude

• Peptic ulcer disease: Responsible for ~10% of upper GI symptoms 1
• GERD with or without esophagitis: Over 50% of GERD patients have no endoscopic esophagitis and can be confused with FD 1
• Helicobacter pylori infection: Main cause of non-NSAID peptic ulcers and contributes to FD in a small proportion 1
• Gastric or esophageal malignancy: Rare (<0.5%) but critical to exclude 1

Functional Dyspepsia vs. Gastroparesis

FD and gastroparesis are symptom-based constructs with significant overlapping features that cannot be fully distinguished by symptoms or gastric emptying studies alone. 1 The preferred terminology is "FD with or without delayed gastric emptying" rather than gastroparesis, as the gastroparesis construct may overemphasize motor deficits. 1

Common Pitfalls

• Do not rely on symptoms alone to distinguish functional from organic causes—endoscopy is required for definitive diagnosis 1
• Heartburn alone is not a dyspeptic symptom, though it may coexist with dyspepsia 1
• The Rome IV criteria are too restrictive for routine practice—use the 8-week clinical criteria to avoid delaying diagnosis and treatment 1
• Subtype classification (EPS vs. PDS) has limited therapeutic implications in current practice, as evidence for subtype-specific treatment responses remains limited 1