Differential Diagnosis of Epigastric Pain and Gastrointestinal Bleeding

Immediate Life-Threatening Conditions to Exclude First

The American College of Cardiology recommends obtaining an ECG within 10 minutes and serial cardiac troponins at 0 and 6 hours to rule out acute coronary syndrome, which presents atypically with epigastric pain in up to 20% of cases, with mortality rates of 10-20% if missed 1
The American College of Radiology suggests checking vital signs immediately for tachycardia ≥110 bpm, fever ≥38°C, or hypotension, and performing physical examination specifically looking for peritoneal signs to rule out perforated peptic ulcer, which carries 30% mortality if treatment is delayed 3, 1, 4
The American Gastroenterological Association recommends checking serum lipase (≥2x normal) or amylase (≥4x normal) with 80-90% sensitivity and specificity to rule out acute pancreatitis, which has an overall mortality of <10% but reaches 30-40% in necrotizing pancreatitis 1, 4

The American College of Gastroenterology states that dark stools (melena) indicate upper gastrointestinal bleeding, which is the most common complication of peptic ulcer disease, occurring in 2-10% of cases 3, 2
The American College of Radiology reports that peptic ulcer disease has an incidence of 0.1-0.3%, with complications occurring in 2-10% of cases 3, 5
The American Gastroenterological Association notes that gastritis presents with enlarged areae gastricae, disruption of normal polygonal pattern, thickened gastric folds, or erosions on imaging, and is commonly caused by Helicobacter pylori infection (42% of cases) and NSAID use (36% of cases) 5, 4, 2
The National Comprehensive Cancer Network states that gastric cancer has an incidence of 7.3 per 100,000 with 5-year survival of 32%, and is now the most common cause of gastric outlet obstruction in adults 5

The American College of Gastroenterology recommends ordering a complete blood count to check for anemia (alarm feature requiring urgent endoscopy) 1, 4
The American Gastroenterological Association suggests ordering serum lipase or amylase to exclude acute pancreatitis 1
The American College of Radiology recommends ordering liver and renal function tests, and serum electrolytes and glucose 1, 4

The American College of Gastroenterology recommends starting high-dose PPI therapy immediately, with omeprazole 20-40 mg once daily before meals, which has healing rates of 80-90% for duodenal ulcers and 70-80% for gastric ulcers 1, 4
The American Gastroenterological Association suggests using ondansetron 8 mg sublingual every 4-6 hours, promethazine 12.5-25 mg orally/rectally every 4-6 hours, or prochlorperazine 5-10 mg every 6-8 hours for nausea 4

The American College of Gastroenterology recommends performing upper endoscopy immediately in patients with alarm features, such as dark stools (melena indicating GI bleeding) or persistent nausea after every meal 1, 4
The American Gastroenterological Association notes that endoscopy capabilities include directly visualizing ulcers, obtaining tissue for histopathology, performing H. pylori testing from biopsies, and ruling out malignancy 2
The American College of Radiology suggests that age considerations, such as age ≥55 years with persistent symptoms, warrant non-urgent endoscopy, but alarm features mandate urgent evaluation regardless of age 1, 4