Gallstones, the NHS said, are “common”, affecting about one in 10 UK adults. They’re small “stones,” usually made out of cholesterol, that form in the bladder.

They don’t usually cause any problems, the health service added. But when they do, eg when they get stuck in a bile duct, they can cause “severe” pain. Complications, like gallstone disease, can also arise.

Your risk of getting gallstones rises once you’re over 40, and if you’re a woman, especially if you’re a woman who’s had children.

But why?

Why are women more........

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