Primary biliary cirrhosis (PBC) is a chronic condition inside the liver. It is swelling in a part of the liver called bile ducts. Over time, this swelling can cause permanent damage to the bile ducts.

The liver creates a fluid called bile. The fluid is sent out of the liver through bile ducts. The bile then moves to the gallbladder and the small intestine. Bile helps break down food in the intestines. PBC makes it difficult for bile to move out of the liver. The bile is not able to pass through the damaged bile ducts. As a result, the bile backs up into the liver. This leads to liver damage.

Bile Ducts
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The exact cause of PBC is unknown. However, because 95% of patients have specific autoantibodies, it may be due to an autoimmune disorder. This means the immune system is attacking health tissue.