Cholelithiasis: Definition, Etiology, and Symptoms
Cholelithiasis is the presence of gallstones in the gallbladder, a common condition affecting approximately 10-15% of the adult US population, with the majority (80%) remaining asymptomatic throughout their lives 1, 2.
Definition
Cholelithiasis refers specifically to the formation and presence of stones (calculi) within the gallbladder. The condition becomes increasingly prevalent with age, affecting approximately 20% of adults over 40 years and 30% of those over 70 years 3. The disease shows a marked female predominance during reproductive years (female-to-male ratio of 4:1), which narrows to near equality in older populations 3.
Etiological Factors
Primary Pathophysiology
Gallstone formation results from imbalanced bile composition, specifically:
- Cholesterol oversaturation in bile
- Low levels of bile acids
- Gallbladder stasis 4
Types of Gallstones
Two main categories exist:
- Cholesterol gallstones (most frequent type)
- Pigment gallstones 4
Risk Factors
Non-modifiable factors:
- Age (increases with advancing age)
- Female sex
- Pregnancy and increasing parity 5
Modifiable factors:
Medical conditions:
Other factors:
Clinical Symptoms
Asymptomatic Presentation
Approximately 80% of patients with gallstones remain asymptomatic, and an estimated 80% will never develop symptoms throughout their lives 7, 2. These cases are typically discovered incidentally during imaging for other conditions 8.
Symptomatic Cholelithiasis
Classic biliary pain (biliary colic):
- Sharp, stabbing pain in the right upper quadrant or epigastric region 2, 5
- Pain occurs 30-60 minutes after meals 3
- Characterized as severe, steady pain that appears suddenly 8
- Unaffected by household remedies, position change, or gas passage 8
- Episodes last more than 15 minutes (typically sustained) 8
Associated symptoms:
- Nausea and vomiting (frequently reported) 9, 5
- Referred pain to the right supraclavicular region and/or shoulder 5
- Anorexia 9
- Fever (when complications develop) 9
Important Clinical Distinctions
Symptoms NOT attributable to gallstone disease 8:
- Belching
- Bloating
- Intolerance of fatty foods
- Chronic, persistent pain
- Pain that frequently comes and goes
- Pain lasting less than 15 minutes
Physical examination findings:
- Positive Murphy's sign (tenderness upon palpation of right upper quadrant during deep inspiration) 5
- However, lack of physical examination findings does not rule out cholelithiasis 5
Complications
When symptomatic, cholelithiasis can progress to serious complications 8, 4:
- Acute cholecystitis (inflammation of the gallbladder)
- Choledocholithiasis (common bile duct stones, present in approximately 10% of gallstone disease) 1
- Acute cholangitis (ascending cholangitis)
- Acute pancreatitis (gallstone pancreatitis)
- Obstructive jaundice
- Secondary biliary cirrhosis (with prolonged obstruction)
- Gallstone ileus (rare)
- Gallbladder cancer (accounts for one-third to one-half of gallstone-related deaths, though absolute risk is low at 0.0002 per year) 8
Clinical Pitfalls
The classic biliary pain occurs in the minority of individuals; more commonly, symptomatology is ambiguous 7. Atypical symptoms including indigestion, flatulence, heartburn, bloating, belching, and nausea (dyspeptic symptoms) are less reliably associated with gallstones and are less likely to resolve following cholecystectomy 7.