Gallstones are hard, pebble-like deposits that form inside the gallbladder. Gallstones may be as small as a grain of sand or as large as a golf ball.

See also:

• Acute cholecystitis
• Choledocholithiasis

Cholelithiasis; Gallbladder attack; Biliary colic; Gallstone attack; Bile calculus; Biliary calculus

The cause of gallstones varies. There are two main types of gallstones:

• Stones made out of cholesterol. Gallstones made out of cholesterol are by far the most common type. Cholesterol gallstones have nothing to do with the cholesterol levels in the blood.
• Stones made from too much bilirubin in the bile. Bile is a liquid made in the liver that helps the body digest fats. Bile is made up of water, cholesterol, bile salts, and other chemicals, such as bilirubin. Such stones are called pigment stones.

Gallstones are more common in women, Native Americans and other ethnic groups, and people over age 40. Gallstones may also run in families.

The following also make you more likely to develop gallstones:

• Failure of the gallbladder to empty bile properly (this is more likely to happen during pregnancy)
• Medical conditions that cause the liver to make too much bilirubin, such as chronic hemolytic anemia, including sickle cell anemia
• Liver cirrhosis and biliary tract infections (pigmented stones)
• Diabetes
• Bone marrow or solid organ transplant
• Rapid weight loss, particularly eating a very low-calorie diet
• Receiving nutrition through a vein for a long period of time (intravenous feedings)

Many people with gallstones have never had any symptoms. The gallstones are often discovered when having a routine x-ray, abdominal surgery, or other medical procedure.

However, if a large stone blocks either the cystic duct or common bile duct (called choledocholithiasis), you may have a cramping pain in the middle to right upper abdomen. This is known as biliary colic. The pain goes away if the stone passes into the first part of the small intestine (the duodenum).

Symptoms that may occur include:

• Pain in the right upper or middle upper abdomen:
  • May go away and come back
  • May be sharp, cramping, or dull
  • May spread to the back or below the right shoulder blade
  • Occurs within minutes of a meal
• Fever
• Yellowing of skin and whites of the eyes (jaundice)

Additional symptoms that may occur with this disease include:

• Abdominal fullness
• Clay-colored stools
• Nausea and vomiting

It is important to see a doctor if you have symptoms of gallstones. Gallstones are found in many people with gallbladder cancer.

Tests used to detect gallstones or gallbladder inflammation include:

• Abdominal ultrasound
• Abdominal CT scan
• Endoscopic retrograde cholangiopancreatography (ERCP)
• Gallbladder radionuclide scan
• Endoscopic ultrasound
• Magnetic resonance cholangiopancreatography (MRCP)
• Percutaneous transhepatic cholangiogram (PTCA)

Your doctor may order the following blood tests:

• Bilirubin
• Liver function tests
• Pancreatic enzymes

This version of the Encyclopedia has no treatment information. Please discuss any and all treatment options for your condition with your healthcare professional.

Gallstones develop in many people without causing symptoms. The chance of symptoms or complications from gallstones is low. Nearly all patients who have gallbladder surgery do not have their symptoms return (if the symptoms were actually caused by gallstones).

Blockage of the cystic duct or common bile duct by gallstones may cause the following problems:

• Acute cholecystitis
• Cholangitis
• Cholecystitis - chronic
• Choledocholithiasis
• Pancreatitis

Call for an appointment with your health care provider if you have:

• Pain in the right upper part of your abdomen
• Yellowing of the skin or whites of the eyes

There is no known way to prevent gallstones. If you have gallstone symptoms, eating a low-fat diet and losing weight may help you control symptoms.

Siddiqui T. Early versus delayed laparoscopic cholecystectomy for acute cholecystitis: a meta-analysis of randomized clinical trials. Am J Surg. 2008;195(1):40-47.

Chari RS, Shah SA. Biliary system. In: Townsend CM, Beauchamp RD, Evers BM, Mattox KL. Sabiston Textbook of Surgery. 18th ed. St. Louis, Mo: WB Saunders; 2007:chap. 54.

Afdhal N. Diseases of the gallbladder and bile ducts. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap. 159.