Causes and Risk Factors
Gallstones form when the chemical balance of bile is disturbed, allowing cholesterol or bilirubin to crystallize. Risk factors include:- Female sex and age over 40: Estrogen increases cholesterol in bile, and risk rises steadily with age.
- Excess body weight: A major risk factor for cholesterol stones.
- Rapid weight loss: Very low-calorie diets and weight-loss surgery can trigger stone formation as the liver releases extra cholesterol into bile.
- Family history: Gallstones tend to run in families.
- Metabolic conditions: Diabetes and fatty liver disease share risk factors with gallstones and often occur alongside them.
- Diet: Diets high in refined carbohydrates and low in fiber are associated with higher risk.
- Certain medications and conditions: Estrogen therapy, prolonged fasting, and diseases of the small intestine such as Crohn's disease can also promote stone formation.
Symptoms
Most gallstones are "silent" and cause no symptoms; these are usually discovered incidentally on imaging and need no treatment. A gallbladder attack (biliary colic) occurs when a stone temporarily blocks a bile duct, typically causing:- Steady upper abdominal pain: Usually in the right upper abdomen or center of the abdomen, often beginning after a rich or fatty meal or at night, lasting from thirty minutes to several hours.
- Pain radiating to the back or right shoulder blade: A classic pattern of gallbladder pain.
- Nausea and vomiting: Frequently accompany the pain.
Complications
A stone that stays lodged can cause inflammation or infection of the gallbladder (cholecystitis), blockage of the main bile duct with jaundice, infection of the bile ducts (cholangitis), or inflammation of the pancreas (pancreatitis). These conditions are serious and need urgent hospital treatment, but with prompt care most people recover fully.Diagnosis
An abdominal ultrasound is the best first test and detects most gallstones. Blood tests check for infection, liver-enzyme abnormalities, and pancreatic inflammation. When the diagnosis is unclear, a HIDA scan can assess gallbladder function, and MRCP — a specialized MRI — can look for stones in the bile ducts.Treatment
- Silent stones: Gallstones that cause no symptoms generally need no treatment, only awareness of the warning signs.
- Symptomatic stones: Once gallstones cause attacks, they tend to keep doing so. The standard treatment is laparoscopic cholecystectomy — minimally invasive removal of the gallbladder — which is one of the most common and safest operations performed, and most people digest food normally without a gallbladder.
- Nonsurgical options: For selected patients who cannot have surgery, bile-acid medication can slowly dissolve small cholesterol stones, though stones often return when it is stopped.
When to Seek Immediate Care
Seek emergency care for abdominal pain lasting more than a few hours, pain with fever or chills, yellowing of the skin or eyes, or dark urine with pale stools. These suggest a blocked duct or infection. If you are having episodes of upper abdominal pain after meals, an evaluation can determine whether gallstones are the cause. The internal-medicine team at Zimmer Medical Group can arrange the right imaging and guide you through treatment decisions.Living With Gallstones
Most people with gallstones will never need anything done, and most who have had one attack will have another. The practical decisions are whether to have the gallbladder out, what the operation and recovery involve, and what to do about the conditions that share its symptoms.
Silent stones are usually left alone
Stones found by chance on a scan for something else are not removed, because most never cause trouble and the operation carries its own small risk. Exceptions are discussed individually, such as very large stones, a calcified gallbladder wall, or stones found in people awaiting a transplant. Knowing the warning signs, and not fearing every twinge, is the whole plan for silent stones.
After one attack, the question is when
Once a stone has caused biliary colic, further attacks are likely and each one carries the chance of a complication, so laparoscopic gallbladder removal is offered rather than waiting for a second episode. The operation is usually same-day or one night in hospital, with four small incisions, a return to desk work within a week, and normal activity in two to three. Fat is tolerated normally within weeks in most people; a minority have looser stools after fatty meals for months, which a bile-acid binder such as colesevelam controls. Bile-acid tablets to dissolve stones work slowly, only for small cholesterol stones, and the stones return once they stop, which is why they are reserved for people who cannot have surgery.
Weight loss, GLP-1 medications, and diet
Rapid weight loss, whether from a very low-calorie diet, bariatric surgery, or a GLP-1 medication such as semaglutide or liraglutide, raises the chance of new stones and attacks, so upper abdominal pain during weight loss is not dismissed as a side effect; our GLP-1 side effects article explains what to watch. Gradual loss with regular meals is safer than fasting, because a meal empties the gallbladder. A Mediterranean pattern with fiber, nuts, and unsaturated fat is associated with fewer stones, and fatty liver disease and obesity share the same drivers.
What gallstones are confused with
Because a third of adults over 60 have stones, an ultrasound that shows them does not prove they are the cause of the pain. Burning that improves with antacids is more often GERD or peptic ulcer disease; cramping with bloating and altered bowel habit suggests irritable bowel syndrome; and upper abdominal pressure with exertion, sweating, or breathlessness is checked as angina. Removing a gallbladder for pain that was never biliary leaves the pain in place, which is why the pattern matters more than the scan.
Emergencies, and the pancreas
Pain lasting more than a few hours, fever, jaundice, or dark urine means a stone has lodged and needs hospital care, and a stone passing into the shared duct is the most common cause of pancreatitis, a reason gallbladder removal follows that illness promptly. Our gallbladder attacks article explains the difference between an attack that can wait until morning and one that cannot. Our gastrointestinal team arranges imaging and the surgical consultation. The NIDDK and MedlinePlus publish patient guidance on gallstones and gallbladder surgery.
If you have had an episode of upper abdominal pain after meals, or gallstones were found on a scan and nobody discussed what they mean, schedule a visit.