Primary Biliary Cholangitis (PBC) is a chronic disease that can, little by little, destroy some of the tubes (called bile ducts) that link your liver to your gut.
The bile ducts carry fluid called bile to your intestine.
When PBC damages your bile ducts, bile can no longer flow through them. Instead, it builds up in the liver, damaging the liver cells and causing inflammation and scarring.
Over the years, this damage can become widespread. The liver becomes less able to repair itself, leading to a condition known as cirrhosis. The damage caused to your liver cells by cirrhosis can result in the failure of your liver to carry out all of its function properly.