
Gallstones, also called cholelithiasis, are small stone-like materials that are found in the gallbladder. The gallbladder is a small sac that contains the bile, which is the digestive fluid produced by the liver to break down and digest fats.
The common bile duct is a tube that allows the bile to flow from the gallbladder to the small intestine. If the gallstones move from the gallbladder into the common bile duct, the medical term for this condition is choledocholithiasis.
Gallbladder stones are made of hardened bile. The bile is made up of cholesterol, water, fats, bile salts and bilirubin (red blood cells waste product). If the bile contains high levels of cholesterol, bilirubin or bile salts, it becomes less aqueous and therefore hardens into stones.
Gallstones can be present as one large gallstone, up to the size of a golf ball, or as little stones, or even a combination of both.
Types of gallstones
There are two types of gallstones:
- Cholesterol stones, which are the most common type
- Pigment stones, which are formed when there is a high level of bilirubin in the system
You may have a mixture of both cholesterol stones and pigment stones.