Dyspepsia Classification and Diagnostic Guidelines

1. Overall Classification and Prevalence

• Dyspepsia is divided into organic dyspepsia (identifiable structural/biochemical abnormalities) and functional dyspepsia (FD), the latter further subdivided into Postprandial Distress Syndrome (PDS) and Epigastric Pain Syndrome (EPS) according to Rome IV criteria. 1
• Organic dyspepsia accounts for roughly 20 % of dyspepsia cases and includes peptic ulcer disease (~10 %), gastro‑esophageal reflux disease (GERD), gastric or esophageal cancer, pancreatic or biliary disorders, and medication‑related causes (especially NSAIDs). 2
• Functional dyspepsia represents about 80 % of patients who undergo endoscopy and have no structural abnormality explaining their symptoms. 1

2. Functional Dyspepsia Subtype Definitions

2.1 Epigastric Pain Syndrome (EPS)

• Defining symptom: bothersome epigastric pain or burning occurring ≥ 1 day per week. 3
• Typical pattern: pain/burning is present regardless of meals, although it may be induced or relieved by food intake. 3
• Associated features: may coexist with post‑prandial epigastric bloating, belching, and nausea. 3

2.2 Postprandial Distress Syndrome (PDS)

• Defining symptom: bothersome post‑prandial fullness and/or early satiation occurring ≥ 3 days per week. 3
• Typical pattern: symptoms are predominantly triggered by meals; early satiation is severe enough to prevent completion of a regular‑sized meal. 4
• Associated features: post‑prandial epigastric pain or burning, bloating, excessive belching, and nausea. 5

3. Diagnostic Criteria (Rome IV)

• Research criteria: symptom onset ≥ 6 months before diagnosis, with symptoms active in the preceding 3 months. 6
• Clinical practice criteria: cardinal dyspeptic symptoms present for ≥ 8 weeks, facilitating earlier diagnosis and treatment. 1

4. Overlap Between Subtypes

• Overlap of EPS and PDS occurs in up to one‑third of patients seen in secondary or tertiary referral settings, and these patients tend to have more severe symptoms. 1

5. Exclusion Criteria (Features Suggesting Alternative Diagnoses)

• Predominant heartburn (≥ once weekly) points toward GERD rather than dyspepsia. 2
• Persistent vomiting warrants evaluation for other disorders such as gastroparesis. 6
• Symptoms that improve after evacuation of feces or gas should not be classified as dyspeptic. 3

6. Key Organic Causes to Exclude

7. Functional Dyspepsia vs. Gastroparesis

• FD and gastroparesis are symptom‑based constructs with considerable overlap; they cannot be reliably distinguished by symptoms alone or by gastric emptying studies. 6
• Preferred terminology is “FD with or without delayed gastric emptying” rather than labeling as gastroparesis, to avoid overemphasizing motor dysfunction. 6

8. Practical Clinical Recommendations

• Endoscopy is required to definitively differentiate functional from organic dyspepsia; symptoms alone are insufficient. 1
• Heartburn alone is not a dyspeptic symptom, though it may coexist with dyspepsia. 1
• The Rome IV research criteria are often too restrictive for routine practice; the 8‑week clinical criteria should be used to prevent diagnostic delays. 1
• Subtype classification (EPS vs. PDS) currently has limited therapeutic implications, as evidence for subtype‑specific treatment responses is sparse. 5

Guideline for Evaluation and Management of Chronic Epigastric Pain with Nausea and Vomiting

Age‑Stratified Endoscopy Criteria

• In patients ≥ 55 years with chronic epigastric pain, nausea, and vomiting, urgent or non‑urgent endoscopy should be performed according to alarm features; younger patients without alarm features can be managed with a test‑and‑treat strategy for H. pylori and empiric therapy for functional dyspepsia. 7
• Urgent 2‑week‑wait endoscopy is mandatory in patients ≥ 55 years when weight loss is present together with dyspepsia. 7
• Urgent endoscopy is also mandatory at any age when dysphagia occurs. 7
• Non‑urgent endoscopy should be considered in patients ≥ 55 years for:
  
  • treatment‑resistant dyspepsia,
  • dyspepsia accompanied by nausea or vomiting,
  • dyspepsia with a raised platelet count,
  • upper abdominal pain with nausea or vomiting.
• In patients < 55 years, endoscopy is not routinely required unless:
  
  • alarm symptoms develop (dysphagia, haematemesis, objectively documented weight loss),
  • symptoms persist despite appropriate empiric therapy, or
  • there is a family history of gastro‑oesophageal cancer, inflammatory bowel disease, or coeliac disease. 7

Diagnostic Testing

• Test all patients with dyspepsia for Helicobacter pylori infection. 7
• Functional dyspepsia should be diagnosed only after symptom persistence following successful H. pylori eradication. 7

Medication Review

• Identify and address causative medications, including:
  
  • Non‑steroidal anti‑inflammatory drugs (NSAIDs) – known to cause gastrointestinal injury and motility changes,
  • Opioids – may alter gut motility,
  • Recent medication changes that could precipitate symptoms. 7

Lifestyle and Risk‑Factor Modification

• Smoking is a recognized risk factor for post‑prandial distress syndrome; smoking cessation should be advised. 7
• Excess alcohol consumption should be reduced as part of management. 7

Endoscopy Timing and Clinical Priorities

• Do not delay endoscopy in older patients; the age cutoff of 55 years is evidence‑based, and the presence of nausea and vomiting with dyspepsia in this group warrants endoscopic evaluation even in the absence of other alarm features. 7
• Objective documentation of weight loss is essential for determining the urgency of endoscopic assessment; subjective reports alone are insufficient. 7

Epigastric Pain Syndrome (EPS): Definition, Diagnosis, and Clinical Considerations

Definition and Core Features

• EPS is a subtype of functional dyspepsia defined by bothersome epigastric pain or burning that occurs at least one day per week, independent of meal timing, and impacts usual activities. 8

Diagnostic Criteria

• Diagnosis requires the presence of either bothersome epigastric pain or bothersome epigastric burning (or both) on at least one day per week, with symptom onset at least six months prior and active symptoms in the past three months per Rome IV criteria. 8

Distinguishing EPS from Postprandial Distress Syndrome (PDS)

• The primary distinction is that EPS symptoms are not linked to meals, whereas PDS is characterized by meal‑triggered post‑prandial fullness and early satiation occurring ≥3 days per week. 8

Associated Clinical Features

• Nausea may accompany EPS, but persistent vomiting suggests an alternative diagnosis. 8

Essential Exclusionary Tests

• Upper endoscopy must show no structural disease that could explain the symptoms. 8
• Pain that meets biliary pain criteria must be excluded. 8
• Symptoms that are relieved by evacuation of feces or gas must be excluded. 8

Pathophysiological Context

• When defined as “pure” EPS without overlap with PDS, EPS accounts for approximately 20–30 % of functional dyspepsia cases, though prevalence varies with the strictness of meal‑relationship definitions. 8

Common Clinical Pitfalls

• Misclassifying heartburn as dyspeptic pain is a frequent error; heartburn is not a dyspeptic symptom, although it may coexist. 8
• EPS and gastroparesis are symptom‑based constructs with considerable overlap and cannot be reliably distinguished solely by symptoms or gastric emptying studies. 8

Diagnosis and Evaluation of Immediate Post‑Prandial Epigastric Pain

Epidemiology and Functional vs. Organic Dyspepsia

• In patients undergoing endoscopy for dyspepsia, ≈ 80 % are diagnosed with functional dyspepsia while ≈ 20 % have an identifiable organic cause (peptic ulcer disease ≈ 10 %, GERD, malignancy < 0.5 %)【9】.
• Functional dyspepsia is strongly associated with a meal‑related temporal pattern; the immediate onset of epigastric pain after eating points toward a meal‑related dyspeptic syndrome【9】.

Postprandial Distress Syndrome (PDS) – Key Diagnostic Features

• Early satiation that prevents completion of a regular‑sized meal is a core diagnostic criterion for PDS【9】.
• ≈ 50 % of patients with PDS report post‑prandial epigastric pain, making this symptom common in the syndrome【9】.

Overlap with Gastro‑Esophageal Reflux Disease (GERD)

• ≈ 33 % of functional dyspepsia patients have concurrent GERD symptoms, underscoring the need to assess for reflux when evaluating dyspepsia【10】.

Essential Organic Causes to Exclude

Peptic Ulcer Disease

• NSAID use is a major risk factor for peptic ulcer disease and should be specifically queried during assessment【10】.

Gastro‑Esophageal Reflux Disease (GERD)

• A burning sensation that starts in the epigastrium and radiates to the chest helps differentiate GERD from functional dyspepsia【10】.

Biliary Colic

• Abdominal ultrasound is recommended when epigastric pain of < 1 year duration exhibits characteristics of biliary colic【10】.

Gastric Malignancy

• Although representing < 0.5 % of dyspepsia cases, gastric cancer must be ruled out with endoscopy in appropriate risk groups (no specific citation).

Age‑Stratified Diagnostic Algorithm (Patients < 55 y, No Alarm Features)

• Test for Helicobacter pylori using breath or stool testing and apply a test‑and‑treat strategy without immediate endoscopy【10】.

Required Baseline Investigations

Endoscopic Confirmation

• Endoscopy showing no structural disease is required to definitively diagnose functional dyspepsia, although a provisional diagnosis can be made based on typical symptoms while arranging investigations【10】.

Clinical History Elements that Influence Diagnosis

• Current smoking is a recognized risk factor for PDS【10】.
• Recent acute enteric infection is present in ≈ 10 % of functional dyspepsia patients【10】.
• Family history of gastro‑esophageal cancer, inflammatory bowel disease, or coeliac disease should be documented as it may affect risk stratification【10】.
• Co‑existence of other functional disorders or chronic pain syndromes is relevant for comprehensive assessment【10】.

Pitfalls to Avoid

• Do not exclude functional dyspepsia solely because heartburn is present, given the high overlap with GERD【10】.
• Do not attribute epigastric pain to gallstones without confirming biliary colic criteria on imaging【10】.
• Symptoms that improve with defecation suggest irritable bowel syndrome rather than dyspepsia【10】.