Primary biliary cholangitis (primary biliary cirrhosis): a patient guide

Bile is a liquid made in the liver that helps digest fats, absorb certain vitamins and carry waste away. It leaves the liver through small tubes called bile ducts. In primary biliary cholangitis, as the NHS explains, the immune system mistakenly attacks the bile ducts, which become damaged and injured, causing bile to build up in the liver, further damaging it and possibly leading to scarring, or cirrhosis.

The disease was long called primary biliary cirrhosis. Liver UK says the name was changed because it was a bit misleading: it develops slowly, over many years, and most people with PBC do not have cirrhosis, which means advanced scarring. The NHS page still notes the older name in brackets because many patients, older leaflets and some clinicians continue to use it, and the abbreviation PBC covers both.

The NHS says PBC does not always cause symptoms. When they occur, they can include bone and joint aches, fatigue described as extreme tiredness, itchy skin, dry eyes and mouth, and pain or discomfort in the upper right side of the tummy. Fatigue and itch are the symptoms most likely to affect daily life, and neither tracks neatly with how abnormal the blood tests are.

This is why many diagnoses are incidental. The NHS says many people are only diagnosed after a routine blood test for another reason. A raised alkaline phosphatase, a liver enzyme linked to the bile ducts, is a typical prompt for further testing. Receiving a diagnosis without feeling unwell can be disorientating, but early identification is what allows treatment to start before significant scarring has occurred.

• Persistent fatigue that sleep does not relieve.

• Itchy skin.

• Dry eyes and dry mouth.

• Aching bones and joints.

• Discomfort under the right ribs.

The NHS says PBC can usually be diagnosed using blood tests alone. Once it is diagnosed, an ultrasound scan is used to rule out other problems with the bile ducts and to assess the liver. A liver biopsy, in which a small sample of tissue is removed and examined under a microscope, is occasionally recommended to assess the liver and to help doctors decide on the best treatment.

The blood tests typically include liver function tests and a search for specific antibodies, notably anti-mitochondrial antibodies, which are characteristic of the condition. Further tests may assess how stiff or scarred the liver is and look for other autoimmune conditions that tend to cluster with PBC. Your specialist team will explain which are needed in your case.

The NHS describes PBC as a progressive condition, with a rate of progression that varies between individuals and that can sometimes take decades. It says current treatments such as ursodeoxycholic acid and obeticholic acid can help slow down liver damage caused by PBC, that other medicines can help relieve itchiness, and that occasionally, if the liver is severely damaged, a liver transplant may be needed.

Treatment response is monitored with repeat blood tests, which is how clinicians judge whether the main medicine is working and whether a second drug should be added. Itch management is a separate matter and often needs trial and adjustment. Fatigue is harder to treat directly, so attention turns to sleep, mood, other medical contributors such as thyroid disease or anaemia, and pacing.

The NHS lists the problems that can follow if PBC is not treated or reaches an advanced stage: osteoporosis, in which bones become weak and brittle; portal hypertension, raised pressure in the blood vessels in the abdomen; ascites, a build-up of fluid in the abdomen; vitamin deficiencies including vitamins A, D, E and K; and a slightly increased risk of developing liver cancer. Without treatment the liver may become so badly damaged that it no longer works properly, which is liver failure.

That list explains the shape of long-term follow-up: regular blood tests, periodic assessment of liver stiffness or scarring, attention to bone health, and surveillance for complications when cirrhosis is present. The aim of the follow-up is to catch change early and to adjust treatment before complications emerge.

Liver UK, the UK liver charity, describes PBC as a long-term condition that usually develops very slowly and has patient information on living with it, ongoing tests and treating advanced disease. Support, information and a nurse-led helpline are available through the charity, and the NHS page points to further reading on symptoms and treatment.

Practical matters include checking with the specialist team or pharmacist before starting new medicines or supplements, reviewing alcohol intake with the team, keeping vaccinations up to date, and reporting new symptoms such as jaundice, swelling of the abdomen or black stools promptly. Having a copy of recent results and the name of the treating service makes any unplanned care smoother.