A single episode of gallstone pain typically lasts one to five hours, and roughly three out of four bile duct stones pass on their own without surgical intervention. But the full timeline from the moment a stone begins to move until it clears the digestive tract depends on factors like the stone’s size, where it gets lodged, and whether it triggers complications along the way. For many people, a small stone slips through in a matter of hours; for others, a larger or poorly positioned stone can mean days or weeks of uncertainty and, sometimes, an emergency procedure.
What Actually Happens When a Gallstone Moves
Gallstones form inside the gallbladder, a small pouch tucked beneath your liver that stores and concentrates bile. Most sit there quietly for years. Trouble starts when a stone gets pushed out of the gallbladder and into the narrow ducts that carry bile toward the small intestine. The gallbladder contracts after you eat, squeezing bile through the cystic duct and then into the common bile duct, which empties into the duodenum through a tiny opening called the ampulla of Vater. A stone can get caught at any point along that path.
If a stone is small enough, it moves through the cystic duct into the common bile duct and then out through the ampulla without causing lasting damage. One retrospective study found that about 73% of patients with confirmed bile duct stones had passed them spontaneously by the time they were re-examined, though passage rates varied depending on the original presentation: roughly 80% of those who had pancreatitis, 84% of those with biliary colic, and 93% of those with gallbladder inflammation had cleared their stones on their own.1PubMed Central. Spontaneous passage of bile duct stones: frequency of occurrence and relation to clinical presentation Patients presenting with jaundice had a lower spontaneous passage rate of about 55%, likely because the stone was large or firmly wedged enough to block bile flow.
How Stone Size and Location Change the Timeline
Size is probably the single biggest factor in whether a gallstone passes quickly or gets stuck. The common bile duct in an average adult is about 6 to 8 millimeters wide, and the ampulla of Vater is even narrower. Stones under about 5 mm tend to slip through with relative ease. As stones get bigger, the odds of spontaneous passage drop steadily. A study using logistic regression to identify what predicted whether a stone would pass found that smaller stone size was a strong predictor of spontaneous clearance, along with a distal location (closer to the intestinal end of the duct) and having only a single stone rather than multiple ones.2PubMed. Spontaneous passage of common bile duct stones after magnetic resonance imaging
That said, size is not an absolute cutoff. Case reports have documented gallstones larger than 1 cm passing spontaneously through the common bile duct and into the duodenum, suggesting that the duct and ampulla can stretch more than you might expect.3PubMed Central. Large gallstones may pass spontaneously Still, these are exceptions. If you have been told your stone is over a centimeter, most clinicians will not simply wait and hope for the best.
Location matters too. A stone sitting in the distal (lower) part of the common bile duct, near the ampulla, is already close to the exit and more likely to pass than one lodged higher up near the junction with the cystic duct. The same predictive analysis found that distal location roughly doubled the odds of spontaneous passage compared to a more proximal position.2PubMed. Spontaneous passage of common bile duct stones after magnetic resonance imaging
What the Pain Feels Like and How Long It Lasts
The hallmark symptom of a gallstone trying to pass is biliary colic, a steady ache in the upper right abdomen or the pit of the stomach. Despite the word “colic,” the pain does not come and go in sharp waves like intestinal cramps. It tends to build, hold at a plateau, and then slowly subside. A study of pain patterns found that biliary colic typically lasts one to five hours, often begins at night, and can radiate to the back or right shoulder blade.4PubMed. The circadian rhythm of biliary colic Nausea is common during an episode, and some people vomit.
The pain is caused by the gallbladder or duct wall stretching and contracting against the stone, not by the stone scraping tissue as many people imagine. Once the stone either passes through or falls back into a wider part of the duct, the pain eases. If you have a single episode that resolves within a few hours and does not come with fever, yellowing skin, or worsening pain, the stone may have already cleared. Recurrent episodes, especially with escalating severity, suggest the stone is stuck or that another stone is on the move.
One pattern worth knowing: the pain often has a circadian rhythm, hitting most frequently between about 9 p.m. and 4 a.m. Researchers believe this relates to when the gallbladder contracts and bile composition shifts during fasting overnight.4PubMed. The circadian rhythm of biliary colic Contrary to popular belief, eating a fatty meal is not the most common trigger. The timing has more to do with the gallbladder’s own emptying cycle than with any single food you ate for dinner.
When a Stone Gets Stuck
The real danger is not the pain itself but what happens when a stone lodges at the ampulla and refuses to move. A stone blocking the common bile duct traps bile upstream, which can cause jaundice, infection, and damage to surrounding organs. Three complications deserve special attention.
Acute cholangitis is a bacterial infection of the bile duct system that develops when bile stagnates behind a blockage. It classically shows up as the combination of fever, jaundice, and abdominal pain. Gallstones blocking the common bile duct are the most frequent cause.5Nature Reviews Gastroenterology & Hepatology. Diagnosis and management of acute cholangitis If left untreated, cholangitis can progress to sepsis. This is a medical emergency, not something to manage with over-the-counter painkillers at home.
Gallstone pancreatitis happens when a stone blocks the ampulla where both the bile duct and the pancreatic duct empty into the intestine. Backed-up pancreatic juice activates digestive enzymes inside the pancreas itself, causing inflammation that ranges from mild swelling to life-threatening tissue death. A landmark surgical study found impacted stones at the ampulla in about 63% of patients with acute biliary pancreatitis, and the severity of the pancreatic damage correlated directly with how long the blockage lasted.6Surgery. Etiology and Pathogenesis of Acute Biliary Pancreatitis Patients whose obstruction was relieved within 48 hours recovered completely in 98% of cases, but prolonged blockage produced irreversible damage. That correlation between time and severity is the reason emergency rooms take gallstone pancreatitis seriously and intervene quickly.
Obstruction of both the bile duct and the pancreatic duct by persisting stones can compound the damage.7PubMed Central. The theory of ‘persisting’ common bile duct stones in severe gallstone pancreatitis This is why doctors do not usually recommend a “wait and see” approach once pancreatitis has been diagnosed; the window for safe observation is narrow.
How Gallstones Are Found
If you show up in an emergency room with upper abdominal pain, the first imaging test is usually a standard ultrasound. It is cheap, fast, and widely available, and it picks up stones in the gallbladder reliably. Its weakness is detecting stones that have already migrated into the common bile duct. One study found that ultrasound missed bile duct stones in about 45% of confirmed cases.8PubMed Central. Is preoperative MRCP necessary for patients with gallstones? An analysis of the factors related to missed diagnosis of choledocholithiasis by preoperative ultrasound This is a surprisingly high miss rate, and it is the main reason doctors often order additional imaging when bile duct stones are suspected.
Magnetic resonance cholangiopancreatography (MRCP) is a specialized MRI scan that provides much better images of the bile ducts. It is non-invasive and does not require sedation. However, even MRCP can struggle with very small stones under about 5 to 6 mm. For patients where MRCP or CT comes back inconclusive, endoscopic ultrasound (EUS) is a high-accuracy alternative, with reported diagnostic accuracy above 94% for bile duct stones.9Advances in Digestive Medicine. The efficacy and accuracy of endoscopic ultrasound for detecting common bile duct stones in intermediate to high‐risk patients with non‐diagnostic CT or MRCP
A practical implication: if you had an ultrasound that showed “no stones in the bile duct” but your symptoms strongly suggest otherwise (worsening pain, jaundice, abnormal liver blood tests), push for further imaging. A normal ultrasound does not rule out a duct stone.
What Happens If a Stone Will Not Pass on Its Own
When a bile duct stone is stuck, the standard treatment is endoscopic retrograde cholangiopancreatography, or ERCP. This procedure replaced open surgery decades ago as the first-line approach.10PubMed Central. Endoscopic extraction of large common bile duct stones: A review article During ERCP, a flexible scope is passed through the mouth, down the esophagus, and into the duodenum. The doctor locates the ampulla, makes a small cut to widen the opening (sphincterotomy), and then extracts the stone using a tiny basket or balloon catheter. Most patients go home the same day or the next morning.
For stones still sitting inside the gallbladder and causing recurrent symptoms, cholecystectomy (surgical removal of the gallbladder) is the most definitive treatment. Guidelines recommend it for most people with symptomatic gallstones unless they prefer a period of observation to see if pain recurs.11PubMed. Treatment of gallstones Laparoscopic cholecystectomy is minimally invasive, usually involves a one-night hospital stay, and has a recovery period of about one to two weeks for most people.
Non-Surgical Options for Gallbladder Stones
Not everyone is a good candidate for surgery. For patients who are elderly, have serious medical conditions, or refuse an operation, there are non-surgical approaches, though they come with important trade-offs.
Ursodeoxycholic acid (ursodiol) is an oral medication that can slowly dissolve certain types of gallstones. It works best on small, non-calcified, cholesterol-based stones. Complete dissolution has been observed in about 81% of patients with stones measuring 5 mm or less, but stones larger than 20 mm rarely dissolve with medication alone.12Journal of Translational Gastroenterology. A Review of Ursodeoxycholic Acid Therapy for Cholelithiasis and Choledocholithiasis The treatment typically takes months, and recurrence after stopping the medication is common.
Extracorporeal shock-wave lithotripsy (ESWL) uses focused sound waves to shatter stones into smaller fragments that can then pass or dissolve more easily. A randomized trial found that combining lithotripsy with ursodiol cleared stones in about 21% of patients after six months, compared to 9% with lithotripsy alone. Among patients with a single stone under 20 mm, the success rate with combined treatment reached about 35%.13PubMed. The effect of ursodiol on the efficacy and safety of extracorporeal shock-wave lithotripsy of gallstones Another trial using repeated high-energy lithotripsy sessions reported higher clearance rates of about 77% for small single stones, though results were lower for larger or multiple stones.14Gastroenterology. Safety and efficacy of repeated shockwave lithotripsy of gallstones with and without adjuvant bile acid therapy Still, stone recurrence within four years approaches 30 to 50%, which is why most gastroenterologists regard lithotripsy as a secondary option.12Journal of Translational Gastroenterology. A Review of Ursodeoxycholic Acid Therapy for Cholelithiasis and Choledocholithiasis
Living Without a Gallbladder
If your gallbladder is removed, your liver continues to produce bile, but there is no longer a reservoir to concentrate and release it in bursts. Instead, bile trickles continuously into the small intestine. Most people adjust without major issues, but some develop loose stools or diarrhea in the weeks and months following surgery. One study found that the proportion of patients reporting more than one bowel movement per day roughly doubled one month after cholecystectomy and remained elevated at three months.15The American Journal of Gastroenterology. Bowel habits and bile acid malabsorption in the months after cholecystectomy Loose stools went from about 2% of patients before surgery to nearly half at one month, though the rate dropped somewhat by three months.
The mechanism behind post-cholecystectomy diarrhea involves excess bile acids reaching the colon, where they stimulate water and electrolyte secretion.16PubMed Central. Diagnosis and treatment of post-cholecystectomy diarrhoea Research on gut bacteria after gallbladder removal has also found shifts in the microbiome, with reduced diversity and lower levels of beneficial bacteria like Bifidobacterium in patients who develop persistent diarrhea compared to those who do not.17PubMed Central. Changes in gut microbiota composition and diversity associated with post-cholecystectomy diarrhea For most people, these bowel changes settle down within a few months. A small percentage deal with chronic loose stools long-term and may benefit from bile acid-binding medications prescribed by a gastroenterologist.
When You Have Gallstones but No Symptoms
Plenty of people learn they have gallstones incidentally, during an imaging scan done for something else entirely. The natural instinct is to want them out. But long-term follow-up studies consistently show that only a small minority of asymptomatic gallstones ever cause problems.18PubMed Central. Asymptomatic Gallstones (AsGS) – To Treat or Not to? One study tracking asymptomatic patients for a median of about four years found that only 10% developed symptoms, and just 7% ended up needing surgery.19PubMed Central. The natural history of diagnosed gallstone disease in symptomatic and asymptomatic patients
This means that for most people with silent gallstones, observation is the recommended approach. Surgery carries its own risks and recovery burden, and removing a gallbladder that might never have caused trouble does not clearly improve outcomes. Exceptions exist: patients with a porcelain gallbladder (calcified wall), very large stones over 3 cm, or certain conditions that raise the risk of gallbladder cancer may be advised to proceed with surgery even without symptoms. But for the typical incidental finding, the evidence favors watching and waiting.
Diet, Rapid Weight Loss, and Gallstone Prevention
Once you have had one symptomatic gallstone episode, the question of prevention becomes very real, whether you keep your gallbladder or not. Diet plays a documented role in gallstone formation. Eating patterns high in refined sugars, fructose, and saturated fat while low in fiber increase the risk, while diets rich in fiber, olive oil, fish, vegetables, coffee, and moderate amounts of vitamin C appear protective.20PubMed Central. The Role of Diet in the Pathogenesis of Cholesterol Gallstones
One particularly underappreciated risk factor is rapid weight loss. Very-low-calorie diets dramatically increase gallstone formation, likely because the gallbladder empties less frequently when caloric intake drops sharply, allowing bile to stagnate and cholesterol crystals to form. A randomized trial found that 28% of patients on a very-low-calorie diet developed gallstones over the study period, compared to just 2 to 3% of those who took a preventive dose of ursodiol at the same time.21PubMed. Prophylaxis against gallstone formation with ursodeoxycholic acid in patients participating in a very-low-calorie diet program If you are planning a medically supervised weight-loss program or bariatric surgery, ask your doctor about prophylactic ursodiol. The evidence for it is strong.
Pregnancy and Gallstone Risk
Pregnancy is one of the most common settings for new gallstone formation. Rising estrogen levels during pregnancy change how the liver handles cholesterol, producing bile that is more saturated with cholesterol than usual. At the same time, the gallbladder becomes sluggish, emptying less completely after meals.22Annals of Hepatology. Cholesterol cholelithiasis in pregnant women: pathogenesis, prevention and treatment These two factors together create ideal conditions for stone formation. Many pregnancy-related gallstones are small and resolve on their own after delivery as hormone levels return to normal, but some persist and become symptomatic in the postpartum period.
Managing gallstones during pregnancy is tricky because the symptoms overlap with other pregnancy-related complaints like heartburn and nausea, and most imaging and surgical options carry at least theoretical risks to the fetus. Ultrasound is safe and remains the first-line diagnostic tool. If surgery becomes necessary, the second trimester is generally considered the safest window for laparoscopic cholecystectomy during pregnancy. Conservative management with IV fluids, pain control, and dietary adjustments is often tried first, reserving surgery for recurrent or complicated episodes.
Why Gallstones and Kidney Stones Are Not the Same Problem
People who have dealt with kidney stones sometimes assume the experience of passing a gallstone will be similar. The two conditions involve completely different organ systems, different types of stones, and different pain patterns. Kidney stones form in the urinary tract from mineral deposits and cause pain as they travel down the ureter toward the bladder. Gallstones form from cholesterol or bile pigments and move through the biliary tree toward the intestine. Kidney stone pain is famously sharp and radiates to the groin; gallstone pain is usually a deep, steady ache in the upper abdomen.
The passage timeline also differs. Small kidney stones often take days to weeks to travel from the kidney to the bladder, with intermittent bouts of pain along the way. Gallstone episodes, as noted earlier, tend to peak and resolve within a few hours for stones that are going to pass. A gallstone that has not cleared within a day or two is unlikely to pass on its own and will probably need intervention. Unlike kidney stones, there is no equivalent of “drink lots of water and wait” for gallstones; the bile duct system does not respond to hydration the way the urinary tract does. If you are unsure which kind of stone you are dealing with, the location of the pain and basic blood and urine tests will usually make the distinction clear.