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Primary Biliary Cirrhosis (PBC) - Topic Overview

What is primary biliary cirrhosis (PBC)?

Primary biliary cirrhosis (PBC) is a kind of cirrhosis caused by damage to the bile ducts in the liver. Much like other forms of liver disease, PBC permanently damages the liver as tissue is replaced with scar tissue (fibrosis). As more scar tissue develops, the structure and function of the liver are affected.

What causes PBC?

The exact cause of PBC is unknown. But it may be related to a problem with the immune system, which is the body's natural defense system.

What are the symptoms?

Many people who have primary biliary cirrhosis do not have symptoms. When symptoms do occur, they may include:

With more advanced liver damage, people may have complications related to cirrhosis such as:

  • Fluid buildup in the abdomen (ascites).
  • Bleeding of enlarged veins in the esophagus, stomach, and rectum (variceal bleeding).
  • Premature thinning of the bones (osteoporosis).

How is PBC diagnosed?

Primary biliary cirrhosis is suspected based on a medical history, physical exam, and lab tests that show high levels of the enzyme alkaline phosphatase and antimitochondrial antibodies (AMA) in the blood. Your doctor may also conduct an imaging test such as an ultrasound, which shows images of the liver and other tissues inside the body. He or she may also do a biopsy to remove a small piece of tissue from the liver. Biopsy is the best way to definitively diagnose PBC.

How is it treated?

Treatment for primary biliary cirrhosis is difficult, because the immune system appears to be involved. As with other forms of cirrhosis, treatment focuses on reducing symptoms, preventing and treating the complications of the disease, and preventing other conditions that may cause additional liver damage.

The medicine ursodiol is usually given soon after a diagnosis of primary biliary cirrhosis. Ursodiol helps move bile out of the liver and into the small intestine. If it is used early enough, ursodiol can improve liver function and may keep you from needing a liver transplant. The medicine may also help you live longer.1

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