Gallstones are hardened deposits of digestive fluid that can form in your gallbladder. Your gallbladder is a small, pear-shaped organ on the right side of your abdomen, just beneath your liver. The gallbladder holds a digestive fluid called bile that's released into your small intestine. Gallstones can vary in size and number and may or may not cause symptoms.
People who experience symptoms usually require gallbladder removal surgery. Gallstones that don't cause symptoms usually don't need treatment.