25/02/2021 · Gallstones (gall stones) are formed from bile, bilirubin, and cholesterol. They are common, and usually have no symptoms. However, when they do occur, the most common symptoms are biliary colic and cholecystitis. Biliary colic pain comes on suddenly, is constant, severe, and loed in the middle or right of the upper abdomen. Diet changes have not shown to treat or prevent gallstones.