Silent gallstones: why the best operation is often no operation

“You have gallstones.” For many people the sentence arrives out of nowhere — a line in an ultrasound report done for something else entirely, during a check-up or while looking at the kidneys. No pain, no complaints, just stones. The reflex is understandable: if something is there that should not be, take it out. Yet for stones that cause no symptoms, German and European guidelines agree on the opposite advice. In most cases, the right operation is no operation.

What silent stones actually do

The reason is the natural history. According to the European Association for the Study of the Liver (EASL), roughly 0.7–2.5% of people with asymptomatic gallstones develop gallstone-related symptoms each year, and complications — acute inflammation of the gallbladder (cholecystitis), pancreatitis, jaundice or infection of the bile ducts — occur in about 0.1–0.3% per year. Expressed per 1,000 people with silent stones: about 7 to 25 develop symptoms in a given year, and 1 to 3 develop a complication.

Long-term cohorts point the same way. A US review summarising a 25-year follow-up of nearly 300 people with silent or minimally symptomatic stones, and a 24-year Scandinavian study of more than 1,200 people, put the rate of new symptoms at about 1–2% per year, with complications rare — about 4% over 25 years — and usually preceded by typical attacks of pain. That last point matters: most people get a warning before anything serious happens.

What the guidelines say

The German S3 guideline on gallstones (AWMF register 021/008, version 2018) states that asymptomatic gallstones are, as a rule, no indication for removing the gallbladder (cholecystectomy). The guideline has passed its formal validity period and is being revised; the 2018 text remains the most recent German version. The EASL guideline from 2016 makes the same call: routine treatment of asymptomatic gallbladder stones is not recommended. EASL rates the underlying evidence as very low quality — there are no randomised trials comparing early surgery with watchful waiting — but the consistent cohort data on the low complication rate carry the recommendation.

EASL also advises against routinely removing a silent stone-bearing gallbladder “while we're in there” during other abdominal operations, including bariatric surgery, or during kidney, lung or pancreas transplantation. Diabetes alone is not a reason for prophylactic surgery.

The exceptions

A small number of findings tip the balance towards surgery even without symptoms, mainly because of the risk of gallbladder cancer:

• Gallbladder polyps of 10 mm or more. EASL recommends cholecystectomy regardless of symptoms (strong recommendation, moderate-quality evidence); the German guideline says the same for patients with gallstones and polyps of 1 cm or more. For polyps of 6–10 mm alongside silent stones, or polyps that grow, EASL says surgery should be considered. Polyps of 5 mm or less are no reason to operate.
• Porcelain gallbladder — a calcified gallbladder wall. The German guideline says these patients should have their gallbladder removed; EASL is more cautious (“may undergo”), noting that surgery may be avoided when the calcification is uniform. Older series suggested very high cancer rates; more recent series report 0–5%.
• Stones larger than 3 cm. The German guideline recommends that cholecystectomy be considered.
• Specific populations. EASL advises considering cholecystectomy in people with hereditary spherocytosis or sickle cell disease when the spleen is being removed, and it may be recommended for people with primary sclerosing cholangitis (a chronic bile duct disease) who have gallbladder polyps of any size.

Surgery is safe — but not free

Laparoscopic cholecystectomy is one of the most common operations and generally a safe one. Its most feared complication is injury to the main bile duct. EASL puts the rate of major bile duct injury today at 0.2–0.4%, with reported rates for any injury ranging from 0.04% to 1.5%, and notes that the true figure is probably underreported. In the Swedish national register (51,041 cholecystectomies), 1.5% had a recorded bile duct injury, and patients with an injury had a higher one-year mortality (3.9% versus 1.1%).

Put the numbers side by side. Operating on 1,000 people with silent stones would cause roughly 2 to 4 major bile duct injuries — in people of whom, left alone, about 1 to 3 per year would develop a complication, usually after warning symptoms that still allow a planned operation. For most people, that trade does not favour surgery.

What counts as a symptom

The decision depends on whether the stones are truly silent, and here precision matters. Typical biliary pain — biliary colic — is described in both guidelines as clearly remembered attacks of severe pain in the upper middle or right upper abdomen lasting at least 15–30 minutes, often for hours, sometimes radiating to the back or right shoulder, frequently with nausea. Pain lasting more than five hours suggests acute cholecystitis and needs prompt assessment.

Bloating, a sense of fullness, heartburn, flatulence or vague indigestion are not typical of gallstones. They are just as common in people without stones and in irritable bowel syndrome, and the German guideline notes that they often persist after the gallbladder is removed. An operation for these complaints risks the complications of surgery without relieving the problem.

Once genuine colic has occurred, the picture changes: EASL notes that about half of patients have another attack, and complications then occur in 1–3% per year. Guidelines advise surgery for symptomatic stones — yet a recent survey of 220 Italian physicians found that almost half would also recommend surgery for asymptomatic or mildly symptomatic patients, a reminder that practice does not always follow evidence.

This article is general information and not individual medical advice. Decisions about tests and treatment belong in a conversation with your own physician.