Bile is a viscous liquid, of a yellow or greenish color, produced by the liver. It is stored in the gallbladder and is useful in the process of digestion when it is emptied into the initial part of the small intestine via the bile duct. Bile salts are used to dissolve fat. They also eliminate certain medications and rid the liver of certain toxins. Bile can sometimes form stones that, if they obstruct the routes of excretion of bile, generate gallstones responsible for the pain of liver colic. If the bile becomes infected, it is cholecystitis which appears as right upper abdominal pain with nausea, vomiting, and fever. An abdominal ultrasound is used for diagnosis and the ??treatment is the removal of the gall bladder or cholecystectomy.