Occurs when stone expelled from gallbladder becomes impacted in the common bile duct
If infected, becomes Cholangitis
Gallstones are classified as cholesterol stones and pigmented stones (black and brown), and are present in approx 20% of females and 8% of males in the United States
These stones cause the majority of all biliary tract problems, and depending on where the stone become impacted, specific problems occur.
Bile flows out the gallbladder, down the cystic duct into the common bile duct, and ultimately into the 1st portion of the duodenum.
Symptomatic cholelithiasis (biliary colic)<unk> 
Acute calculous cholecystitis
Ascending cholangitis
Acalculous cholecystitis
Choledocholithiasis
Gallbladder disease
Ascending cholangitis
Acute cholecystitis
Acalculous cholecystitis
Cholangitis
Acute calculous cholecystitis
Symptomatic cholelithiasis/Biliary Colic