What is the likely cause of epigastric/right‑upper‑abdominal pain radiating to the back that was triggered by a fatty meal and relieved by vomiting, and how should it be evaluated and managed?

Biliary Colic or Acute Cholecystitis

Your symptoms—right upper quadrant/epigastric pain radiating to the back, triggered by a fatty meal (pizza and beer), and dramatically relieved by vomiting—are classic for biliary colic or acute cholecystitis, and you need urgent evaluation with transabdominal ultrasound and liver function tests as the first-line workup. 1

Why This Is Most Likely Biliary Disease

The clinical pattern you describe is textbook for gallbladder pathology:

• Pain location and radiation: Right upper quadrant/epigastric pain radiating to the back occurs in 35% of biliary disease cases, significantly more than functional dyspepsia (20%) 2
• Fatty food trigger: Pain precipitation by fatty foods occurs in 40% of biliary disease versus only 9-19% in peptic ulcer or functional dyspepsia 2
• Vomiting relief: The dramatic pain relief after vomiting suggests obstruction that was temporarily decompressed
• Timing: The acute severe episode after pizza/beer (high fat content) is the classic biliary colic presentation 1

Immediate Evaluation Algorithm

Step 1: Transabdominal ultrasound + liver function tests

• These are the recommended first-line investigations for suspected common bile duct stones (CBDS) 1
• Ultrasound has 73% sensitivity and 91% specificity for detecting stones 1
• Normal results do NOT exclude disease if clinical suspicion remains high 1

Step 2: If ultrasound/LFTs are equivocal or normal but symptoms persist

• Proceed to MRCP (magnetic resonance cholangiopancreatography) as the next test 1
• MRCP is highly accurate for identifying bile duct stones in intermediate-probability patients 1
• Alternative: Endoscopic ultrasound (EUS) if MRCP unavailable or contraindicated 1

Step 3: If stones are confirmed

• You should undergo stone extraction even if currently asymptomatic 1
• The 2017 Gut guideline is emphatic: leaving stones in place leads to 25.3% unfavorable outcomes (pancreatitis, cholangitis, obstruction) versus 12.7% with planned extraction 1
• This recommendation applies even to small stones <4mm 1

Alternative Diagnoses to Consider (Less Likely)

Acute pancreatitis is possible given:

• Epigastric pain radiating to back is the classic presentation 3
• Vomiting is common
• However, gallstones cause up to 50% of acute pancreatitis cases anyway 1, so this would still point to biliary pathology
• If suspected, check serum amylase and lipase 3

Peptic ulcer disease is less likely because:

• Only 31% of peptic ulcers radiate to the back (versus 35% for biliary) 2
• Fatty food precipitation is uncommon (11% duodenal ulcer, 9% peptic ulcer) 2
• Coffee, alcohol, and acidic foods are more typical triggers 2

Critical Pitfalls to Avoid

1. Don't assume normal ultrasound rules out biliary disease: Sensitivity is only 73%, and small stones can be missed 1
2. Don't adopt "watchful waiting" if stones are found: The GallRiks study definitively showed conservative management leads to worse outcomes 1
3. Don't delay imaging: The ACR Appropriateness Criteria emphasize early CT or ultrasound for epigastric pain to avoid missing gastric cancer or perforation 4

What to Do Now

Schedule an urgent appointment (within 1-2 days) with your primary care physician or gastroenterologist to order:

• Transabdominal ultrasound
• Complete metabolic panel including bilirubin, alkaline phosphatase, ALT, AST
• If pain recurs severely, go to the emergency department for immediate evaluation and possible CT abdomen with IV contrast 4

The evidence strongly supports that your symptom pattern represents biliary pathology until proven otherwise, and current guidelines mandate active treatment rather than observation if stones are confirmed 1.