The gallbladder is located right under the liver. It is a small sac that stores bile, a substance that helps the body digest fats. The cystic duct (or bile duct) moves bile from the gallbladder to the small intestine through a series of tubes. Problems with your gallbladder can occur when this duct is blocked. The most likely cause of a bile duct block is a gallstone, however, things like strictures or cancers are also possible. If your gallbladder isn’t releasing bile correctly, and you don’t have a stone, you may notice you have a hard time tolerating fatty foods.