Primary biliary cholangitis explained

What PBC is

The liver makes a fluid called bile that helps digest fats and carries away waste. Bile drains through a network of tiny tubes, the bile ducts, that join into larger ones and lead to the gut. In primary biliary cholangitis, the immune system mistakenly attacks and inflames the smallest bile ducts inside the liver. Over time these ducts are damaged and bile builds up, which can gradually injure liver cells and, in some people, lead to scarring. PBC is an autoimmune condition, meaning the immune system turns against part of the body. It is not caused by alcohol and is not infectious. Although the older name was primary biliary cirrhosis, most people do not develop cirrhosis, especially when the condition is found and treated early.

Symptoms and who it affects

PBC is most common in women, usually diagnosed in middle age, and there may be a family tendency to autoimmune conditions. Many people have no symptoms at first and it is discovered when a routine blood test shows abnormal liver results. When symptoms do appear, the two most common are persistent tiredness that is out of proportion to activity, and itching of the skin, which can be worse at night and very troubling. Other features can include dry eyes and mouth, discomfort under the right ribs, and, as the condition advances, jaundice. Some people develop raised cholesterol or thinning of the bones. Because the early stage is often silent, PBC is frequently found by chance, which is one reason routine blood tests are useful.

How it is diagnosed

PBC is often suspected from blood tests. A particular liver enzyme pattern suggesting the bile ducts are affected, together with a specific antibody in the blood called anti-mitochondrial antibody, points strongly to the diagnosis; this antibody is found in most people with PBC. Doctors also check other liver blood tests and may measure how well the liver is working overall. An ultrasound scan of the liver and bile ducts is usually done to rule out a blockage or other causes. A liver biopsy, once routine, is now needed only in uncertain cases or to judge how much scarring is present. Specialist assessment brings these results together, confirms the diagnosis, and works out the stage so that treatment and monitoring can be planned appropriately.

Treatment and monitoring

The main aim of treatment is to slow the condition and relieve symptoms. A medicine that improves bile flow is the standard first treatment and, taken long-term, helps protect the liver in many people; how well the liver tests respond after several months guides what happens next. For those who do not respond well enough, specialists can add other medicines. The troublesome itch has specific treatments that can help, and tiredness is managed with support and by treating other contributing problems such as an underactive thyroid or poor sleep. Because PBC can affect bones and cholesterol, these are checked and treated when needed, and vaccinations and general liver-friendly steps are encouraged. Regular monitoring with blood tests and scans allows treatment to be adjusted and any progression to be picked up early.

Living with PBC

Most people with PBC, especially when it is caught early and responds to treatment, can expect a good quality of life and a normal or near-normal lifespan. Living well means taking treatment regularly, attending monitoring appointments, and reporting new or worsening symptoms such as severe itch, jaundice or swelling. Simple steps help: avoiding excess alcohol, keeping to a healthy weight, staying active, and protecting the bones with enough calcium, vitamin D and weight-bearing exercise as advised. The fatigue and itch of PBC can affect mood and daily life, so emotional support, patient groups and specialist nurses are valuable. A small number of people whose liver becomes badly affected over many years may be assessed for a liver transplant, which can be very successful.