Gallstone Causes: Why They Form and Who Is at Risk
The main gallstone causes are changes in bile composition and a gallbladder that does not empty effectively. Most gallstones form when bile contains more cholesterol than it can keep dissolved. Others develop when there is too much bilirubin, a waste product the body produces when it breaks down red blood cells.
Your liver produces bile throughout the day. The gallbladder stores and concentrates it, then releases it into your small intestine when you eat.
If the chemistry of the bile changes, or the gallbladder does not empty fully, tiny crystals can form and gradually grow into stones. Gallstones can take years to develop, and many people never realise they have them.
The medical term for gallstones is cholelithiasis.
There is rarely one simple explanation for why someone develops gallstones. Age, sex, pregnancy, family history, hormones, body weight, rapid weight loss and certain medical conditions can all contribute.
Some of these risk factors are outside your control. Others may be influenced by how quickly you lose weight and your longer-term eating habits.
If you have already been diagnosed with gallstones and are waiting for an appointment or surgery, you may be wondering what you can safely eat. You can download my free 7-day meal plan and explore my selection of gentle, lower-fat recipes for practical meal ideas.
What Appears to Have Caused Gallstones in My Family
Gallstones have affected several members of my family, but our problems appeared under different circumstances.
In my case, pregnancy seems to have been an important contributing factor. Pregnancy hormones can increase the amount of cholesterol in bile and slow gallbladder emptying, creating conditions in which crystals and stones are more likely to form.
My husband’s experience was different. His gallstone problems appeared after he lost weight, so we believe the amount or speed of his weight loss may have contributed.
My sister also started having gallstone attacks while she was losing weight. We cannot prove that pregnancy or weight loss was the sole cause in any of our cases.
Gallstones often form gradually, and several risk factors may overlap. However, pregnancy and rapid weight loss are both well-recognised gallstone risk factors, and the timing made them seem particularly relevant to our experiences.
Our family’s experience has also taught me that having gallstones does not necessarily mean you have eaten badly or done something wrong.
How Do Gallstones Form?
Gallstones form when one of the substances in bile becomes too concentrated and starts to crystallise. These crystals may remain tiny or gradually join together to form larger stones.
The three main factors involved are:
Too much cholesterol in the bile
Too much bilirubin in the bile
A gallbladder that does not empty fully or frequently enough
The Gallbladder, Liver and Bile Ducts Explained
Your liver produces bile, a digestive fluid made mainly from water, bile salts, cholesterol, bilirubin and other substances. One of bile’s main jobs is to help your body digest and absorb fat.
The gallbladder is a small, pear-shaped organ underneath the liver. It stores and concentrates bile between meals.
When you eat, particularly when a meal contains fat, the gallbladder contracts and releases bile into the small intestine through a system of bile ducts.
Problems can begin when a stone temporarily blocks the gallbladder outlet or moves into one of the bile ducts. This can stop bile from flowing normally and cause pain, inflammation or infection.
Cholesterol Gallstones and Pigment Stones
Cholesterol gallstones are the most common type in Western countries. They are often yellow or yellow-green and form when bile contains more cholesterol than the bile salts and other substances can keep dissolved.
Pigment stones are usually dark brown or black. They form when bile contains too much bilirubin.
This type is more likely to occur in people with certain liver conditions, bile-duct infections or disorders that cause red blood cells to break down more quickly than usual.
Some stones contain a mixture of substances. Gallstones also vary considerably in size.
They may be as small as grains of sand or grow to the size of pebbles. You can have one stone or many stones at the same time.
Why Poor Gallbladder Emptying Matters
Bile becomes more concentrated while it is stored in the gallbladder. If the gallbladder does not contract effectively or often enough, that concentrated bile remains in place for longer.
This gives crystals more opportunity to form and clump together. Long periods of fasting, frequently skipping meals and crash dieting have been associated with a higher risk of gallstones.
When you do not eat for extended periods, the gallbladder contracts less frequently and stores bile for longer. This does not mean occasionally missing a meal will automatically cause gallstones.
Stones usually develop because several factors come together over time.
Who Is More Likely to Develop Gallstones?
Gallstones can affect anyone, but they become more common with age and are diagnosed more often in women. Pregnancy, hormones, family history, body weight, rapid weight loss, certain health conditions and some medicines may also increase the risk.
Age, Sex, Family History and Hormones
The likelihood of developing gallstones increases with age, particularly after 40. Women are also more likely to develop them than men, especially during their reproductive years.
Hormones appear to be one reason for this difference. Oestrogen can increase the amount of cholesterol secreted into bile, while progesterone may slow gallbladder emptying.
This means the following may be associated with an increased risk:
Pregnancy
Having had multiple pregnancies
The combined contraceptive pill
Certain forms or doses of hormone therapy
Pregnancy appears to have played an important part in my own gallstone story. I did not knowingly do anything to cause my stones.
The hormonal and physical changes of pregnancy can simply create conditions in which gallbladder sludge and gallstones are more likely to develop. Genetics matter too.
If a close relative has had gallstones, you may be more susceptible. That inherited risk is not something a particular food or diet can completely remove.
Body Weight, Eating Patterns and Rapid Weight Loss
Living with obesity can increase the risk of cholesterol gallstones, partly because the liver may release more cholesterol into bile. However, losing weight very quickly is a separate and important risk factor.
During rapid weight loss, the liver releases additional cholesterol into bile. At the same time, eating very little fat or going for long periods without food may mean the gallbladder empties less frequently.
This combination can make stone formation more likely. This is something we have seen in my family.
My husband developed gallstone problems after losing weight, and my sister started experiencing gallstone attacks during a period of weight loss too. We cannot know whether weight loss was their only risk factor, but the timing suggests it may have contributed or brought an existing problem to the surface.
This does not mean you should avoid reaching a healthier weight. Gradual, sustainable weight loss is generally preferable to crash diets, prolonged fasting or very rapid changes.
Many health organisations suggest that around 1 to 2 pounds, or approximately 0.5 to 1 kilogram, per week is a reasonable rate for many people. Individual advice may differ.
If you are following a medically supervised weight-loss programme, taking weight-loss medication or preparing for bariatric surgery, ask your healthcare team about your personal gallstone risk.
Can Weight-Loss Surgery Cause Gallstones?
Gallstones can develop after bariatric surgery because substantial weight loss may occur over a relatively short period. The surgery itself is not necessarily the direct cause; the rapid change in weight and metabolism plays an important part in the increased risk.
Some patients may be offered medicine to reduce the likelihood of developing gallstones during rapid weight loss. The medical team providing the treatment should make this decision.
Health Conditions Associated With Gallstones
Certain health conditions can affect bile composition, cholesterol metabolism, bilirubin levels or gallbladder emptying. These include:
Diabetes and insulin resistance
Crohn’s disease, particularly when it affects the end of the small intestine
Cirrhosis and some other forms of liver disease
High triglyceride levels
Sickle cell disease and other conditions that cause ongoing breakdown of red blood cells
Conditions or surgery that affect the absorption of bile salts
Spinal cord injuries and other conditions that may reduce gallbladder movement
If you have one of these conditions, it does not mean you will definitely develop gallstones. It simply means your risk may be higher.
Medicines That May Increase Gallstone Risk
Some medicines have also been associated with gallstones, gallbladder sludge or changes in bile. Examples include certain oestrogen-containing medicines, fibrates used to reduce blood fats, octreotide and the antibiotic ceftriaxone.
Do not stop taking prescribed medicine because you are worried about gallstones. Speak to your GP, pharmacist or prescribing clinician about the benefits and risks.
What You Can and Cannot Control
You cannot change your age, biological sex, family history or the pregnancies you have already had. You may also have a medical condition that increases your risk through no fault of your own.
Factors you may be able to influence include:
Avoiding crash diets and very rapid weight lossEating regular, balanced meals where possibleIncluding fibre-rich foods in your dietWorking towards a healthy weight gradually
Following advice for managing diabetes, cholesterol or other relevant conditions
These steps cannot guarantee that gallstones will not form, but they may help reduce some avoidable risks.
Can Food and Drink Cause Gallstones?
No single food or drink has been proven to cause gallstones on its own. Gallstone causes are more complicated than one rich meal, one takeaway or one particular ingredient.
Longer-term dietary patterns may influence risk. Diets high in refined carbohydrates and low in fibre have been associated with a greater likelihood of gallstones.
Obesity, rapid weight loss and repeatedly going for long periods without eating may also contribute. A diet containing vegetables, fruit, pulses and wholegrains provides fibre and supports general digestive health.
It is a sensible eating pattern, but it cannot guarantee that gallstones will be prevented.
Can a Fatty Meal Cause a Gallstone Attack?
It is important to separate the cause of a gallstone from the trigger for a gallstone attack.
Gallstones generally form gradually, often over several years. A fatty meal does not create a stone overnight.
However, eating fat tells the gallbladder to contract. If a stone is already present, that contraction may push it against the gallbladder outlet and trigger biliary pain.
This is why some people experience an attack after fried, greasy or particularly rich food. The meal may have exposed an existing problem, but it did not necessarily cause the stone itself.
Although attacks can follow a rich meal, they can also happen several hours later, during the night or without an obvious food trigger.
Eating With Gallstones While Waiting for Medical Advice
While you wait for an appointment or surgery, cutting back on fried, greasy and especially high-fat foods may help manage symptoms. Still, there’s no single gallstone diet that works for everyone.
A low-fat diet for gallstones may help some people have fewer attacks, but it won’t dissolve or remove existing stones. Follow your own healthcare professional’s advice and avoid foods that repeatedly trigger your symptoms.
Keeping a simple food and symptom diary can help. Note what you ate, the portion size, when symptoms began and how long they lasted.
Patterns are often easier to recognise on paper than from memory, and the diary may also prove useful during medical appointments.
If planning meals feels overwhelming, my gallbladder diet menu plan offers practical ideas. You can also read my guide to what not to eat with gallstones.
These resources draw on practical experience and general information. They don’t replace personalised medical or dietary advice.
Gallstone Myths and Facts
| Myth | Fact |
|---|---|
Stress directly causes gallstones | Stress isn’t recognised as a direct cause of gallstones. Changes in bile composition and gallbladder emptying are the main physical processes involved. |
Only overweight people develop gallstones | Obesity raises the risk, but people at any weight can develop gallstones. Rapid weight loss can also make them more likely. |
One fatty meal creates gallstones | Gallstones usually develop over time. A fatty meal may trigger pain by making the gallbladder contract against a stone that’s already there. |
Fasting protects the gallbladder | Frequently fasting for long periods or following a crash diet may increase risk because the gallbladder empties less often. |
Cutting out every source of fat is always best | A completely fat-free diet is usually unnecessary and can make it harder to get essential fatty acids and fat-soluble vitamins. The amount you tolerate is personal, so follow medical advice and limit foods that trigger pain. |
All silent gallstones eventually become painful | Many gallstones never cause symptoms and are found accidentally during tests for something else. |
Having gallstones means you have eaten badly | Diet is only one possible influence. Genetics, hormones, pregnancy, age, medical conditions and weight changes can all play a part. |
Bloating, wind, indigestion and heartburn can occur with gallbladder problems, but these symptoms aren’t specific to gallstones. Acid reflux, irritable bowel syndrome and several other digestive conditions can cause them too, so self-diagnosis can be unreliable.
When Gallstone Symptoms Need Medical Assessment
Many people have silent gallstones and never experience symptoms. When a stone blocks the flow of bile, though, it can cause biliary colic or more serious complications.
Recognising Biliary Colic
Biliary colic is the classic pain associated with gallstones. It’s usually severe and steady, rather than a brief cramp that comes and goes.
The pain may:
Be felt in the upper-right part of the abdomen beneath the breastbone
- Spread to the back or right shoulder
Last from more than 30 minutes to several hours
Be accompanied by nausea or vomiting
It may begin after a rich meal, although it can happen at other times too. Read my guide explaining where gallstone pain is felt for more information.
Symptoms don’t always look the same, so you may also find my articles about gallbladder symptoms in women and gallbladder symptoms in men helpful.
Urgent Warning Signs
In the UK, contact NHS 111 or seek urgent medical advice if you have gallstone-type abdominal pain lasting longer than 30 minutes, particularly if it’s severe, unfamiliar or keeps returning.
Go to A&E or call 999 if the pain is sudden and severe, or if severe abdominal pain spreads to your back and comes with vomiting.
You should also seek urgent medical help if you develop:
A high temperature or shaking chills
Yellowing of your skin or the whites of your eyes
Dark urine or unusually pale stools
Persistent vomiting or an inability to keep fluids down
Confusion, fainting or feeling extremely unwell
These symptoms may point to a complication such as acute cholecystitis, which means inflammation of the gallbladder; cholangitis, an infection in the bile ducts; or acute pancreatitis, which can happen when a stone blocks the pancreatic duct.
Untreated infection can become serious. Don’t drive yourself if you’re severely unwell. Readers outside the UK should use their local urgent-care or emergency service.
How Gallstones Are Diagnosed
Diagnosis usually starts with a discussion of your symptoms, a physical examination and blood tests. Blood tests can show signs of inflammation, infection or problems involving the liver and pancreas.
Clinicians commonly use an abdominal ultrasound to look for stones inside the gallbladder. If they suspect that a stone has moved into a bile duct, you may need further tests, such as an MRI scan called an MRCP or an endoscopic ultrasound.
A CT scan may identify complications or other possible causes of abdominal pain, but it won’t detect every gallstone.
What Treatments May Be Discussed?
Gallstones found by chance that aren’t causing symptoms often need no treatment. Whether you need monitoring or follow-up depends on your individual circumstances and any other health conditions.
For gallstones that repeatedly cause pain or complications, doctors usually recommend a cholecystectomy, an operation to remove the gallbladder. Surgeons most often perform it using keyhole, or laparoscopic, surgery.
If a stone is lodged in the common bile duct, a procedure called ERCP may remove it. During an ERCP, the clinician passes an endoscope through the mouth and into the digestive system to reach the bile-duct opening.
Doctors may occasionally consider bile-acid medicines such as ursodeoxycholic acid for selected patients, but they don’t suit everyone. They can take a long time to work, and stones may return after treatment stops.
A doctor or pharmacist can advise which pain relief is suitable while you wait for treatment. They may suggest paracetamol or an anti-inflammatory medicine, although anti-inflammatory medicines aren’t safe for everyone.
If surgery has been recommended, you may find it helpful to read about gallbladder surgery recovery in advance.
Understanding Gallstone Causes Can Help You Recognise Your Risk
Gallstones form when bile changes composition or the gallbladder doesn’t empty effectively. Excess cholesterol is the most common factor, but bilirubin, age, hormones, genetics, pregnancy, body weight, rapid weight loss and certain health conditions can all contribute.
In my family, pregnancy seems to have played an important part in my own gallstones. My husband and sister developed gallstone problems around periods of weight loss.
Our experiences show that there’s rarely one simple explanation. Developing gallstones doesn’t necessarily mean you have eaten badly or done something wrong.
You can’t change every risk factor, but gradual rather than rapid weight loss, balanced eating and avoiding crash diets may help reduce some risks. If you already have gallstones, record your food triggers, follow your clinician’s advice and seek prompt medical help for severe or prolonged pain, fever, persistent vomiting or jaundice.
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Frequently Asked Questions About Gallstone Causes
Most gallstones form when bile contains more cholesterol than it can keep dissolved. The excess cholesterol may crystallise and gradually grow into stones.
Poor gallbladder emptying can also leave concentrated bile in place for longer, making crystal formation more likely.
Yes, doctors diagnose gallstones more often in women, particularly during the reproductive years. Oestrogen can increase the amount of cholesterol in bile, while progesterone may slow gallbladder emptying.
Pregnancy and certain hormone-containing medicines may therefore increase risk.
Pregnancy can increase the likelihood of gallstones because hormonal changes affect both bile composition and gallbladder movement. Pregnancy seems to have contributed to my own case, although it’s not usually possible to identify one definite cause.
Rapid weight loss is a well-recognised risk factor. It can cause the liver to release additional cholesterol into bile while the gallbladder empties less often.
My husband’s gallstone problems appeared after weight loss, and my sister also began having attacks while losing weight.
Stress isn’t recognised as a direct cause of gallstones. It can affect appetite, eating habits and digestive symptoms, but physical gallstone formation mainly relates to bile composition, gallbladder emptying and other medical or genetic risk factors.
No single food has been shown to create gallstones by itself. Longer-term dietary patterns, body weight and rapid weight loss may influence risk.
A fatty meal may trigger pain when stones are already present because it makes the gallbladder contract, but it doesn’t normally create a stone overnight.
Many gallstones cause no symptoms. When symptoms develop, the first obvious sign may be biliary colic: severe, steady pain in the upper-right or upper-middle abdomen that lasts longer than 30 minutes and may continue for several hours.
The pain may spread to the back or right shoulder and can come with nausea or vomiting.
Gallstones discovered by chance often remain symptom-free and usually don’t need treatment. Your clinician may recommend a different approach if you have particular complications or other health concerns.
Seek medical advice if you later develop persistent upper-abdominal pain, fever, vomiting or jaundice.
Gallstones usually do not disappear on their own. Some stay silent and never need treatment, while symptomatic stones may eventually require gallbladder surgery.
Doctors can prescribe medicines to dissolve certain cholesterol stones in limited situations. Treatment takes time, though, and the stones can come back.
This article shares general information and personal experience. It is not a substitute for diagnosis or advice from your own doctor, surgeon or registered dietitian.
