Gallstones are hardened pieces of digestive fluid that form in the gallbladder. Gallstones can vary in size and number and may or may not cause symptoms. If symptoms do occur, they may include sudden and rapidly intensifying pain in the upper right portion or center of your abdomen, back pain between your shoulder blades, pain in your right shoulder, and/or nausea or vomiting.
Gallstones are diagnosed using blood tests, an MRI, and ERCP. Gallstones that don't cause symptoms usually do not need treatment, but gallstones that do may require surgery to remove the gallbladder or medication to dissolve the gallstones.