The formation of Gallstones is cholelithiasis. Gallstones disease affects millions of people each year and causes significant morbidity. Virtually all gallstones from within the gallbladder. The gallbladder lies on the undersurface of the right lobe of the liver. The main function of the gallbladder is to concentrate, store, and excreted bile which is produced by the liver. Gallstones can pass from the gallbladder into the common bile duct may remain there with or without any symptoms or they may pass into the duodenum.
Cholecystitis is inflammation of gallbladder and it may be acute or chronic. Inflammation of gallbladder caused by gallstones obstructing the bile ducts leading to the backup of bile is known as calculous cholecystitis. Acalculous cholecystitis is an inflammatory disease of gallbladder without evidence of gallstones.