The gallbladder stores bile. Bile is a liquid produced in the liver that aids in digestion. When a person eats, bile flows through a series of tubes or ducts into the intestines . It helps to break up food so that it can be used by the body. When bile is supersaturated with cholesterol or bilirubin, it may form the crystals known as gallstones.
Gallstones are crystals that form from excess cholesterol or bilirubin.
Most cases cannot be prevented. Diagnosis of gallstones starts with a medical history and physical exam. Blood tests are often done to rule out other causes or detect complications. An ultrasound may be ordered to check for gallstones. Many people have asymptomatic gallstones for years without any problem.