Gallstones form when bile, which is normally fluid, forms stones. Bile is a greenish yellow secretion that is produced in the liver and passed to the gallbladder, where it becomes more concentrated and is either stored or passes via the common bile duct into the first part of the small intestine, the duodenum. There are different types of gallstones:
This is a companion discussion topic for the original article at https://patient.info/digestive-health/gallstones-and-bile