Evaluation of Burning Abdominal Pain
For a patient presenting with burning abdominal pain, obtain a focused history to distinguish urgent from non-urgent causes, then proceed directly to CT abdomen and pelvis with IV contrast if urgent pathology is suspected, or ultrasound first if the pain localizes to the right upper quadrant. 1
Initial Clinical Assessment
The burning quality of abdominal pain requires immediate differentiation between life-threatening and benign etiologies. Focus your history on:
- Pain characteristics: Duration (<5 days defines acute), location (localized vs. diffuse), radiation, timing relative to meals
- Associated symptoms: Fever (suggests infection/abscess), vomiting, diarrhea, dysphagia, heartburn
- Red flags: Hemodynamic instability, peritoneal signs, age >65, immunocompromised state, recent surgery
Critical point: Clinical assessment alone has insufficient diagnostic accuracy to identify the specific cause but can effectively discriminate urgent from non-urgent conditions 2. One-third of ED patients with abdominal pain never receive a definitive diagnosis, one-third have appendicitis, and one-third have other documented pathology 1.
Laboratory Testing
Order these tests when urgent pathology is suspected:
- Complete blood count and C-reactive protein
- Hepatobiliary markers (AST, ALT, alkaline phosphatase, bilirubin)
- Lipase
- Urinalysis
- Pregnancy test (if applicable)
- Lactate and metabolic panel if sepsis or ischemia suspected
Important caveat: WBC and CRP alone cannot discriminate urgent from non-urgent diagnoses 2. In elderly patients, laboratory values may be normal despite serious infection 1.
Imaging Strategy
For Non-Localized or Diffuse Burning Pain:
CT abdomen and pelvis with IV contrast is the primary imaging modality 1, 3. This approach:
- Changes the leading diagnosis in 51% of patients 1
- Alters management decisions in 42% of patients 3
- Increases diagnostic certainty from 70.5% to 92.2% 1
The broad differential for burning abdominal pain includes:
- Peptic ulcer disease/gastritis (most common for burning quality)
- Pancreatitis
- Cholecystitis
- Mesenteric ischemia (especially if pain out of proportion to exam)
- Bowel perforation or obstruction
- Diverticulitis
- Abscess formation
Skip plain radiography - it has limited diagnostic value and rarely changes management 1, 4. Use it only to screen for free air if perforation is strongly suspected.
For Right Upper Quadrant Localization:
Start with ultrasound 3. If negative or inconclusive, proceed to CT with IV contrast 2.
For Suspected Peptic Ulcer Disease:
If the burning pain is epigastric, postprandial, or relieved by antacids:
- CT with IV contrast and neutral oral contrast (water or dilute barium) is most sensitive for detecting ulcers and complications 5
- Consider upper endoscopy for definitive diagnosis, especially if alarm features present (dysphagia, bleeding, weight loss, recurrent vomiting) 6
- Fluoroscopic upper GI series is an alternative if endoscopy unavailable, though less sensitive 5
Special Populations:
Elderly patients: Proceed directly to CT - clinical signs are often masked and mortality is higher 1
Immunocompromised/neutropenic: CT with IV contrast is essential as typical signs of sepsis may be absent 1
Pregnant patients: Ultrasound first, then MRI if inconclusive (avoid CT unless emergent and MRI unavailable) 1
Common Pitfalls to Avoid
- Don't delay imaging in high-risk patients waiting for laboratory results - CT changes management even when labs are normal
- Don't obtain CT without IV contrast for non-localized pain - reduced bowel wall enhancement is 100% specific for bowel infarction 1
- Don't repeat CT indiscriminately - diagnostic yield drops from 22% on initial scan to 5.9% on fourth repeat 1
- Don't dismiss burning pain as "just GERD" without excluding urgent causes first - peptic ulcer can perforate, and mesenteric ischemia carries 30-90% mortality 4
When Imaging is Negative
If CT is negative and symptoms persist, consider: