Gallstones, known by its medical term cholelithiasis, is a condition of the gallbladder where hardened deposits (stones) develop within the digestive fluid of the gallbladder.  The gallbladder is a small organ found under the liver on the right side of the body, which stores bile produced by the liver.  After meals, the gallbladder transports bile, a yellowish-brown fluid, to the small intestine and helps the body break up and digest fatty foods.