Gallstones After a Gastric Sleeve: Why They Happen and How to Lower the Risk

Gallstones are a common side effect of the rapid weight loss a gastric sleeve produces: up to about 1 in 3 people form them in the year or so after surgery, most cause no symptoms at all, and the ones that do are treatable. The stones are not caused by the operation itself but by how fast the weight comes off, which is worth understanding so a new ache does not blindside you.

Nobody had really flagged this to me before my own surgery, and about five months in, deep into the fast-loss phase, I got a dull ache under my right ribs after a richer-than-usual meal and briefly convinced myself something had gone wrong with the sleeve. It had not. Here is what is actually going on, and what genuinely helps.

Why rapid weight loss causes gallstones

Gallstones form after a sleeve because losing weight quickly changes the chemistry of bile and slows how often the gallbladder empties. When the body is burning through fat stores fast, the liver releases more cholesterol into bile, and on a very small post-surgery intake the gallbladder squeezes less often, so bile sits and concentrates. That combination lets cholesterol crystallise into stones. It is why rapid weight loss of any kind is listed as a gallstone risk factor: shedding weight faster than about 1.5 kg (roughly 3 lb) a week is enough to raise the odds¹. The sleeve is simply one of the fastest ways to lose weight, which is part of the results people see, so the effect is more pronounced.

How common gallstones are after a sleeve

Gallstones are one of the more common findings after bariatric surgery, reported in up to around a third of patients in the first year, though only a minority ever cause trouble. Rapid weight loss is a recognised risk factor, and gallstones sit among the acknowledged issues that can follow weight loss surgery². The important nuance is that forming a stone and having a problem are two different things: most stones are silent and turn up only by chance on a scan done for another reason. Mayo Clinic lists gallstones among the possible longer term effects of a sleeve gastrectomy precisely because they are frequent but often harmless³.

The symptoms to recognise

The symptom to know is biliary colic: a steady, gripping pain in the upper right tummy or under the breastbone, often an hour or two after a fatty meal. It can spread to the right shoulder blade or back, may bring nausea, and typically lasts anywhere from a few minutes to several hours before easing⁴. That timing, after food rather than random, is what told me mine was worth mentioning. Some warning signs point to a complication rather than a simple stone and need prompt attention: a high temperature, yellowing of the skin or the whites of the eyes, persistent pain that will not settle, or feeling very unwell. Those overlap with the general warning signs after a sleeve and are a reason to get seen rather than wait.

When the risk is highest

The risk peaks while weight is falling fastest, roughly the first 6 to 18 months, then settles as your weight stabilises. Because the trigger is the speed of loss rather than the surgery scar, the danger window tracks the steep part of the curve, the same months when most of the weight comes off¹. Once the loss slows and your weight plateaus, the bile chemistry normalises and the odds of forming new stones drop back toward the background rate. New stones can still appear later, so the pattern matters more than the calendar: any fresh run of right-sided pain after fatty food is worth a mention whenever it starts.

Lowering the risk

You cannot switch off the biology, but steady loss, good hydration, and keeping a little fat in meals all support normal bile flow. Guidance on gallstones is consistent that losing weight at a sensible pace, rather than at extreme speed, lowers the chance of stones forming, which is one more reason to follow the staged plan your team sets rather than starving faster¹. Keeping some healthy fat in each meal helps the gallbladder actually contract instead of sitting idle, and staying well hydrated keeps bile moving. Beyond diet, some bariatric teams prescribe a bile-acid medicine called ursodeoxycholic acid for around the first 6 months after surgery, which can reduce the rate of new stones; whether it is offered varies by team and is a question worth asking yours. It sits alongside the other things that start at surgery, like the lifelong vitamins and follow-up.

Treatment if they cause trouble

Silent stones are usually left alone, but stones that cause pain or complications are normally treated by removing the gallbladder, a routine keyhole operation. You can live perfectly well without a gallbladder; bile simply flows straight from the liver into the gut instead of being stored. A laparoscopic cholecystectomy is one of the most common operations there is, and most people go home the same day or after a single night⁴. Weight loss surgery itself is considered safe for suitable patients, and gallbladder removal is a smaller procedure again, in the same family of routine abdominal operations⁵. The decision about whether and when to operate is one for you and your surgical team, based on your symptoms rather than the mere presence of a stone.

This guide is general information and one person’s experience, not a diagnosis or individual advice. If you have tummy pain, fever, or yellowing of the skin, contact your GP or bariatric team, who can assess you properly.