Confusable diagnoses · PANCE / PANRE

Gastroesophageal Reflux Disease vs Peptic Ulcer Disease

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Gastroesophageal Reflux Disease and Peptic Ulcer Disease are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.

Gastroesophageal Reflux Disease vs Peptic Ulcer Disease at a glance

  • Gastroesophageal Reflux Disease: Retrograde flow of gastric contents into the esophagus producing symptoms or mucosal injury.
  • Peptic Ulcer Disease: Mucosal break >5 mm in the stomach or duodenum, most often due to H. pylori or NSAIDs.

Try two board-style questions on Gastroesophageal Reflux Disease vs Peptic Ulcer Disease

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Question 1GastrointestinalMedium
A 55-year-old woman with chronic GERD on omeprazole 20 mg once daily, which she takes at bedtime, has persistent heartburn and regurgitation after 8 weeks of therapy. She has no dysphagia, weight loss, or anemia. Upper endoscopy shows Los Angeles Grade B erosive esophagitis. Which of the following is the most appropriate next step in management?
  • AIncrease omeprazole to twice daily before meals
  • BAdd oral sucralfate four times daily
  • CSwitch omeprazole to oral famotidine
  • DRefer for laparoscopic Nissen fundoplication
Reveal answer & full explanation
Correct answer: A — Increase omeprazole to twice daily before meals
  • AIncrease omeprazole to twice daily before meals✓
  • BAdd oral sucralfate four times daily
  • CSwitch omeprazole to oral famotidine
  • DRefer for laparoscopic Nissen fundoplication

Why Increase omeprazole to twice daily before meals is correct

  • This patient has endoscopically confirmed erosive esophagitis (Los Angeles Grade B) with an inadequate response to once-daily PPI
  • Proton pump inhibitors bind irreversibly only to actively secreting pumps, so they must be taken 30 to 60 minutes before a meal
  • She is currently dosing at bedtime, which is suboptimal timing
  • Increasing to twice daily and dosing before meals corrects both the dose and the timing and is the appropriate next step
  • Optimizing PPI therapy precedes any escalation to advanced testing or surgery

Why the others are wrong

  • Add oral sucralfate four times daily — right-concept-wrong-setting: sucralfate is a mucosal coating agent with minimal benefit in erosive esophagitis and does not address the inadequate acid suppression
  • Switch omeprazole to oral famotidine — confused-with step-up: H2 receptor antagonists are less effective than PPIs for healing erosive esophagitis and are prone to tachyphylaxis, so this is a step down in potency
  • Refer for laparoscopic Nissen fundoplication — premature-escalation: surgery is reserved for refractory or volume-regurgitation symptoms only after PPI therapy has been optimized and pH-impedance testing performed

Additional high-yield points

  • If symptoms persisted despite correctly dosed twice-daily PPI, ambulatory pH-impedance testing on therapy would be the next investigation
Question 2GastrointestinalMedium
A 47-year-old man with heavy NSAID use has epigastric pain and melena. Which of the following complications is most likely?
  • AUpper gastrointestinal hemorrhage
  • BLower gastrointestinal hemorrhage
  • CGastric outlet obstruction
  • DFree perforation with peritonitis
Reveal answer & full explanation
Correct answer: A — Upper gastrointestinal hemorrhage
  • AUpper gastrointestinal hemorrhage✓
  • BLower gastrointestinal hemorrhage
  • CGastric outlet obstruction
  • DFree perforation with peritonitis

Why Upper gastrointestinal hemorrhage is correct

  • NSAIDs impair prostaglandin-mediated mucosal defense, causing peptic ulcers that erode into submucosal vessels.
  • Melena (black, tarry stool) signals a bleeding source proximal to the ligament of Treitz, classic for a bleeding duodenal or gastric ulcer.

Why the others are wrong

  • Lower gastrointestinal hemorrhage — A lower-tract source typically produces hematochezia, not melena; the black tarry stool points upstream (anchoring on the word bleeding).
  • Gastric outlet obstruction — Chronic ulcer scarring can obstruct, but that causes early satiety and succussion-splash vomiting, not melena (right-disease-wrong-complication).
  • Free perforation with peritonitis — Perforation produces sudden rigid abdomen and pneumoperitoneum, not melena; bleeding and perforation are distinct ulcer complications (premature closure on severity).
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Side-by-side comparison

FeatureGastroesophageal Reflux DiseasePeptic Ulcer Disease
At a glanceRetrograde flow of gastric contents into the esophagus producing symptoms or mucosal injury.Mucosal break >5 mm in the stomach or duodenum, most often due to H. pylori or NSAIDs.
Classic presentationPostprandial retrosternal burning relieved by antacids; nocturnal symptoms relieved by elevating the head of the bed.; Heartburn — retrosternal burning, worse postprandially or supine; Regurgitation of sour/bitter material; Dysphagia (suggests stricture, eosinophilic esophagitis, or malignancy if progressive); Water brash…Duodenal: pain relieved by eating. Gastric: pain provoked by eating.; Epigastric pain — burning, gnawing, or hunger-like; Duodenal ulcer: pain 2-3 h after meals, relieved by food or antacids, nocturnal awakening; Gastric ulcer: pain worsened by food, weight loss; Nausea, early satiety, bloating, belching; Hematemesis, melena, or…
Workup / key labsClinical diagnosis when classic heartburn/regurgitation respond to empiric PPI trial. Objective confirmation by erosive esophagitis (LA grade B, C, or D), biopsy-proven Barrett esophagus, or peptic stricture on EGD, or abnormal pH study (acid exposure time >6%) per Lyon Consensus 2.0; LA grade A alone is not conclusive.; No labs…CBC (anemia from chronic blood loss); BMP, LFTs; Type and screen / crossmatch if acute bleed; H. pylori testing: urea breath test or stool antigen (preferred non-invasive); biopsy-based rapid urease test or histology if EGD performed; Fasting gastrin level if Zollinger-Ellison suspected; Withhold PPI 2 weeks and antibiotics 4 weeks…
ImagingUpper endoscopy (EGD) indicated for alarm features (dysphagia, odynophagia, weight loss, GI bleeding, anemia, vomiting, age ≥60 with new symptoms) or symptoms refractory to 8 weeks of PPI; Ambulatory esophageal pH or pH-impedance monitoring — gold standard for confirming reflux when EGD is normal; performed off PPI for diagnosis or on…Upper endoscopy (EGD) — gold standard; visualizes ulcer, allows biopsy and therapeutic intervention; biopsy ALL gastric ulcers to exclude malignancy; Upright CXR — free air under diaphragm in perforation; CT abdomen with contrast if perforation or complication suspected
First-line treatmentLifestyle modification: weight loss if BMI elevated, elevate head of bed 6-8 inches, avoid recumbency for 3 h after meals, smoking and alcohol cessation, identify and remove dietary triggers; PPI — omeprazole, pantoprazole, esomeprazole — once daily 30-60 min before breakfast for 8 weeks; step-down to lowest effective dose after symptom…PPI — omeprazole, pantoprazole, esomeprazole — 4-8 weeks (8-12 weeks for gastric ulcer); H. pylori eradication if positive (see by_subtype); Discontinue NSAIDs and aspirin if possible; switch to acetaminophen; Lifestyle: smoking cessation, limit alcohol

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Full outlines

Gastroesophageal Reflux Disease (GERD) Peptic Ulcer Disease (PUD) All 514 diagnoses

Educational use only. This outline is a study aid for PA students and is not medical advice or a substitute for clinical judgment. FirstPassPA is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCCPA or PAEA. PANCE® and PANRE® are registered trademarks of the National Commission on Certification of Physician Assistants; End of Rotation™ is a program of the Physician Assistant Education Association.