Gallstones and Biliary Colic
Cholesterol or pigment stones form in a supersaturated gallbladder, and pain occurs only when a stone transiently obstructs the cystic duct against a contracting gallbladder: no sustained obstruction, no inflammation, no pain.
In a nutshell
Gallstones cause disease only when they obstruct a duct. Transient impaction at the cystic duct during gallbladder contraction produces colicky, self-limiting pain with no fever. The moment a stone stays impacted or migrates further, the picture changes to cholecystitis or cholangitis.
Classic presentation
Colicky RUQ or epigastric pain after a fatty meal, radiating to the right scapula, settling within a few hours, with no fever and normal inflammatory markers.
Key points
- Cholesterol stones form from bile supersaturated with cholesterol; pigment stones form from excess bilirubin in haemolysis or stasis.
- Pain is triggered by CCK-driven gallbladder contraction against a transiently obstructing stone: mechanical, not inflammatory.
- Resolution within hours and the absence of fever or raised inflammatory markers are what separate biliary colic from acute cholecystitis.
- Gallstone disease is a single mechanical problem on a spectrum: silent stones, colic, cholecystitis, choledocholithiasis, cholangitis.
- Most gallstones are asymptomatic and require no treatment; symptomatic disease is treated with elective laparoscopic cholecystectomy.
First-line investigation
Transabdominal ultrasound, which is highly sensitive for gallstones and also screens for early complications.
First-line management
Analgesia for the acute episode, then elective laparoscopic cholecystectomy once the diagnosis is confirmed.
Exam traps
- Fever or a positive Murphy's sign means this is no longer simple biliary colic: think acute cholecystitis instead.
- Jaundice with biliary colic-type pain suggests a stone has migrated into the common bile duct, not straightforward colic.
- Normal inflammatory markers with RUQ pain support colic; do not order antibiotics for uncomplicated biliary colic.
Educational content pending clinical review. Not medical advice.