Dyspepsia - proven functional
Exam Tips
- In OSCEs, define proven functional dyspepsia explicitly as persistent upper GI symptoms with normal endoscopy and no structural cause.
- State Rome-style subtypes: epigastric pain syndrome and post-prandial distress syndrome; they can coexist.
- Always mention alarm-feature screening and urgent cancer pathway referral when red flags are present.
- For H. pylori testing, remember washout rules: stop PPIs for 2 weeks and antibiotics for 4 weeks before breath/stool testing.
- Quote first-line eradication structure accurately: PPI BD + two antibiotics for 7 days, adjusted for penicillin allergy and prior clarithromycin exposure.
- Use a gut-brain axis framework in viva answers (consider a labelled schematic from your GI textbook or lecture notes for visual revision).
Definition
Functional dyspepsia is a chronic disorder of gut-brain interaction causing troublesome upper gastrointestinal symptoms (such as epigastric pain/burning, early satiety, or post-prandial fullness) for at least 4 weeks, with no structural explanation on endoscopy. In proven functional dyspepsia, peptic ulcer disease, erosive oesophagitis, and upper GI malignancy have been excluded, and symptoms are classified as epigastric pain syndrome and/or post-prandial distress syndrome.
Pathophysiology
The condition is multifactorial and reflects dysregulated signalling between the stomach/duodenum and central nervous system rather than a single mucosal lesion. Key mechanisms include impaired gastric accommodation and gastroduodenal motility, visceral hypersensitivity to gastric distension or acid, altered acid handling, low-grade duodenal immune activation, microbiome changes, and abnormal central pain processing; psychosocial stressors can amplify symptom perception. Helicobacter pylori may contribute in a subset, but symptom generation often persists despite eradication, supporting a broader gut-brain mechanism.
Risk Factors
- Female sex
- Anxiety and depression
- Recent or previous acute gastroenteritis
- Smoking
- NSAID use
- Helicobacter pylori infection
- Increasing age (higher primary care consultation rates)
Clinical Features
Symptoms
- Epigastric pain or burning (intermittent or persistent)
- Post-prandial fullness
- Early satiety
- Upper abdominal discomfort
- Nausea, with or without occasional vomiting
- Heartburn or acid regurgitation may coexist but predominant reflux symptoms suggest GORD instead
Signs
- Often normal abdominal examination
- Possible mild epigastric tenderness without peritonism
- No structural pathology on prior upper GI endoscopy
- Absence of alarm features on current review (for example progressive dysphagia, GI bleeding, weight loss, persistent vomiting, iron-deficiency anaemia)
Investigations
Management
Lifestyle Modifications
- Explain diagnosis clearly and provide written patient information to reduce health anxiety and improve self-management
- Weight reduction if overweight or obese
- Avoid individual trigger foods (commonly fatty/spicy meals, chocolate, coffee, tomatoes)
- Smaller meals; avoid late evening meals and leave 3-4 hours before bedtime
- Smoking cessation
- Reduce alcohol intake to recommended UK limits
- Screen for stress, anxiety, and depression; offer relaxation strategies and psychological therapy referral when indicated
- Review and reduce/stop aggravating medicines when clinically safe (e. g, NSAIDs, aspirin, bisphosphonates, nitrates, calcium-channel blockers, anticholinergics, theophyllines)
Pharmacological Treatment
Symptom control if H. pylori negative
- Low-dose proton pump inhibitor (PPI) for 1 month, e. g, omeprazole 10-20 mg once daily
- OR standard-dose H2-receptor antagonist for 1 month, e. g, famotidine 20-40 mg daily in divided doses
Use the lowest effective dose and review need after trial period; antacid/alginate can be used short term but continuous long-term self-treatment is discouraged. PPI safety: consider fracture, hypomagnesaemia, C. difficile risk, and interstitial nephritis with prolonged use.
First-line H. pylori eradication (7 days, adult)
- PPI twice daily (choose one): lansoprazole 30 mg BD, omeprazole 20-40 mg BD, esomeprazole 20 mg BD, pantoprazole 40 mg BD, or rabeprazole 20 mg BD
- Plus amoxicillin 1 g BD
- Plus clarithromycin 500 mg BD OR metronidazole 400 mg BD
Check prior macrolide/metronidazole exposure when selecting regimen. Confirm penicillin allergy status before amoxicillin. Clarithromycin: major CYP3A4 interactions (e. g, some statins) and QT-prolongation risk. Metronidazole: avoid alcohol during treatment and for 48 hours after; counsel on metallic taste and GI upset.
H. pylori eradication if true penicillin allergy
- PPI twice daily + clarithromycin 500 mg BD + metronidazole 400 mg BD for 7 days
Check for previous clarithromycin exposure and local resistance considerations. Apply clarithromycin and metronidazole safety counselling as above.
H. pylori quadruple regimen if penicillin allergy and prior clarithromycin exposure
- PPI twice daily
- Metronidazole 400 mg BD
- Tetracycline hydrochloride 500 mg QDS
- Bismuth subsalicylate 525 mg QDS
- Duration: 7 days
Tetracycline is contraindicated in pregnancy/breastfeeding and in children under 12 years; causes photosensitivity and oesophageal irritation (take upright with water). Bismuth subsalicylate: caution with salicylate hypersensitivity, anticoagulants, and severe renal impairment.
Complications
- Reduced quality of life (sleep disturbance, dietary restriction, impaired daily/leisure function)
- Persistent symptom burden with recurrent healthcare use
- If recurrent/refractory H. pylori infection is present: increased risk of peptic ulcer disease
Prognosis
Symptoms are frequently chronic-relapsing. Without effective management, around 70% remain symptomatic at 1 year and lifetime recurrence is about 50%. In H. pylori-positive dyspepsia, spontaneous improvement occurs in a minority, eradication gives modest additional symptom benefit, and many patients still report symptoms over 3-12 months, so expectation-setting is important.
Sources & References
💊BNF Drug References(10)
- Co-magaldrox[management.pharmacological]
- Dexketoprofen[contraindications]
- Lansoprazole[management.pharmacological]
- Magnesium carbonate[management.pharmacological]
- Magnesium trisilicate[management.pharmacological]
- Magnesium trisilicate with magnesium carbonate and sodium bicarbonate[management.pharmacological]
- Omeprazole[management.pharmacological]
- Pantoprazole[management.pharmacological]
- Rabeprazole sodium[management.pharmacological]
- Simeticone with aluminium hydroxide and magnesium hydroxide[management.pharmacological]
✅NICE Guidelines(1)
- Dyspepsia - proven functional[overview]
📖Textbook References(8)
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 677)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 674, 675)[context]
- David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 653)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 269)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 268, 269)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 269)[context]
- [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 269)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1047, 1048)[context]