The gallbladder is a small, pear-shaped organ on the underside of the liver that is used to store bilea substance that the digestive system uses to aid in the digestion of fat. Gallbladder disease is a common condition that mostly affects women, although men can suffer from it too. The symptoms vary widely from mild discomfort to severe pain, which begin after the ingestion of food. In severe cases, the patient can suffer from jaundice, nausea and fever. Gallbladder disease is most often caused by gallstones, which are formed when bile contains too much cholesterol. The excess cholesterol forms crystals from which gallstones are made.