Gallstones form in your gallbladder. This small pear-shaped pouch, just 8 cm long, sits tucked away under your liver, on the upper right side of your tummy. It acts as a storage pouch for a yellow-greenish liquid called bile, produced by your liver. Bile has two main functions - breaking down food (especially fatty food) you've eaten and carrying away waste from your liver.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/could-it-be-gallstones