Gallstones: Symptoms, Causes, and What Treatment Actually Looks Like

What Are Gallstones?

Gallstones are hardened deposits that form inside the gallbladder, a small pear-shaped organ under the liver that stores bile used to digest fat. They form when bile contains too much cholesterol or bilirubin relative to the bile salts that normally keep it dissolved, or when the gallbladder doesn't empty completely and bile becomes overly concentrated. Stones range from grains of sand to the size of a golf ball, and a person can have one large stone or hundreds of small ones.

There are two main types. Cholesterol stones, usually yellow-green, account for roughly 80% of cases and form when the liver excretes more cholesterol than bile can dissolve. Pigment stones, smaller and darker, form when bile contains excess bilirubin, often related to liver disease, blood disorders, or certain infections.

Gallstones can be as small as a grain of sand or as large as a golf ball, and their size doesn't reliably predict whether they'll cause symptoms.

Symptoms: Silent Stones vs. a Gallbladder Attack

Most gallstones — roughly 80% — never cause symptoms at all and are found incidentally during imaging done for an unrelated reason. Problems arise only when a stone blocks one of the ducts that carry bile out of the gallbladder, triggering what's known as biliary colic or a gallbladder attack.

Who Gets Gallstones, and Why

Certain groups are consistently at higher risk in the research: women (especially during and after pregnancy, due to hormonal effects on bile), people over 40, those with obesity or who have lost weight very rapidly, people with a family history of gallstones, and those with diabetes or certain blood disorders. Rapid weight loss is a particularly underappreciated trigger — the liver releases extra cholesterol into bile during fast fat breakdown, and popular GLP-1 weight-loss medications have been associated with an increased short-term gallstone risk in several studies for this reason.

Diet plays a role too: diets high in refined carbohydrates and low in fiber are linked to higher gallstone rates, while regular physical activity and a diet rich in healthy fats (which promote regular gallbladder emptying) appear protective.

How Gallstones Are Diagnosed and Treated

Can Gallstones Be Prevented?

There's no guaranteed way to prevent gallstones, but several evidence-backed habits reduce risk meaningfully. Maintaining a stable, healthy weight rather than cycling through rapid weight loss and regain appears protective, as does eating regular meals rather than skipping them — long gaps between meals reduce how often the gallbladder empties, allowing bile to become more concentrated. A diet with adequate fiber and healthy unsaturated fats, alongside regular physical activity, is consistently associated with lower gallstone risk in large population studies.

For people specifically starting a rapid weight-loss program, whether through diet, bariatric surgery, or newer weight-loss medications, some doctors recommend a preventive medication called ursodiol during the highest-risk period, since the gallstone risk from very fast fat loss is well documented. Anyone with a strong family history of gallstones or who has already had one episode of biliary colic should discuss individualized prevention strategies with their doctor, since the risk of a repeat attack after a first episode is meaningfully elevated.

It's also worth understanding what happens if a gallstone attack is ignored rather than treated. Repeated episodes of biliary colic increase the risk that a stone eventually lodges more permanently, leading to acute cholecystitis — a fully inflamed, sometimes infected gallbladder that typically requires hospitalization and IV antibiotics before surgery. In rarer cases, a stone that migrates into the common bile duct and stays lodged can cause pancreatitis, since the bile duct and pancreatic duct share a common opening into the small intestine. None of this means every twinge of abdominal pain after a meal needs an ER visit, but a pattern of recurring attacks is a signal worth acting on rather than managing indefinitely with diet alone.

People often ask whether gallstones can be seen coming, and to a limited extent, yes. A first mild episode of biliary colic that resolves on its own is common, and roughly two-thirds of people who have one episode will go on to have another within a few years without treatment. This is different from many other conditions where a single incident is a one-off; with gallstones, a first attack is generally treated as a meaningful signal rather than a fluke, which is why doctors typically discuss surgical removal after even one clear episode rather than waiting for repeated attacks to accumulate.

Frequently Asked Questions