The gallbladder is a small organ located beneath the liver in the upper right part of the abdomen. It serves as a reservoir for bile, which is continuously produced by the liver and is essential for fat digestion. Over the course of a day, the liver produces a significant amount of bile, while the gallbladder concentrates it and releases it into the intestine during meals.
Gallstones form when the balance of bile components is disrupted. An excess of cholesterol or bilirubin, or a deficiency of bile acids, leads to crystallization of dissolved substances. Over time, these crystals grow and form stones. They may be single or multiple, microscopic or relatively large.
Most patients develop cholesterol gallstones, which are usually light in color. Pigment stones containing bilirubin are more commonly associated with liver or blood disorders.