Gallstones are thought to be caused by an imbalance in the chemical make-up of bile inside the gallbladder. Bile is a liquid produced by the liver to help digestion.
Gallstones are small stones that form in the gallbladder, a small organ found near the liver.
Gallstones can cause sudden episodes of severe tummy pain. But many people with gallstones have no symptoms.
Gallstones are thought to be caused by too much cholesterol in your gallbladder. Women and people who are overweight or over 40 are most at risk.
Gallstones do not always need to be treated. If they're causing problems, you may need surgery to remove your gallbladder.
Page last reviewed: 10/10/2018
Next review due: 10/10/2021