A gallstone is a stone formed within the gallbladder out of bile components.The term cholelithiasis may refer to the presence of stones in the gallbladder or to the diseases caused by gallstones. Most people with gallstones (about 80%) never have symptoms. In 1–4% of those with gallstones, a crampy pain in the right upper part of the abdomen, known as biliary colic, occurs each year.Complications of gallstones include inflammation of the gallbladder, inflammation of the pancreas, and liver inflammation.Symptoms of these complications may include pain of more than five hours duration, fever, yellowish skin, vomiting, or tea-color urine.