Primary Biliary Cholangitis and Primary Sclerosing Cholangitis: Understanding Autoimmune Liver Disease

Primary biliary cholangitis (PBC) and primary sclerosing cholangitis (PSC) are two distinct autoimmune conditions that affect the bile ducts. Although their names sound similar and both fall under the umbrella of autoimmune liver disease, they behave differently, affect different groups of people, and are managed in different ways. This page brings the two conditions together because they share an underlying mechanism, the immune system mistakenly attacking the bile ducts, while explaining how each one differs. These conditions are separate from the gallstone-related causes of bile duct problems covered on our bile duct obstruction and biliary colic and cholecystitis pages. Here, the bile ducts are affected by the body’s own immune system rather than a blockage from a stone.

What is Autoimmune Liver Disease?

In both PBC and PSC, the immune system mistakenly attacks the cells lining the bile ducts, the tubes that carry bile from the liver to the small intestine. This causes ongoing inflammation and, over time, scarring, which interferes with the normal flow of bile. The exact trigger for this immune response is not known in either condition.

The two conditions differ mainly in which ducts are affected. PBC targets the smallest bile ducts within the liver, while PSC can affect bile ducts of any size, both inside and outside the liver, and causes the distinctive narrowing known as a stricture.

Primary Biliary Cholangitis (PBC)

PBC, previously known as primary biliary cirrhosis, is a rare autoimmune condition in which the immune system attacks the small bile ducts within the liver. Over time, this can inflame the surrounding liver tissue and lead to scarring, though many people with PBC never progress to significant scarring of the liver.

What Causes PBC?

The exact cause of PBC has not been identified, but it is thought to be autoimmune in nature. PBC is more common in women, who are around nine times more likely to develop the condition than men, and it is usually diagnosed in people over the age of 40. Having a close family member with PBC slightly increases your own risk, and the condition is also more common in people who have other autoimmune conditions, such as Sjögren’s disease, autoimmune thyroid disease or Raynaud’s syndrome.

Symptoms of PBC

Many people with PBC have no symptoms at all, particularly in the early stages, and the condition is sometimes picked up during blood tests done for an unrelated reason. When symptoms do occur, the most common are persistent tiredness and itchy skin. Some people also develop jaundice, a yellowing of the skin and eyes, discomfort in the upper right side of the abdomen, or, less commonly, unexplained weight loss or swelling in the feet caused by fluid retention.

How is PBC Diagnosed?

PBC is usually suspected when blood tests show a persistently raised level of a liver enzyme called alkaline phosphatase, or ALP. A specific blood test, looking for anti-mitochondrial antibodies, is positive in the large majority of people with PBC, and together with the enzyme result, this is often enough to confirm the diagnosis. Imaging such as an ultrasound or MRI, and occasionally a liver biopsy, may also be used to rule out other conditions or to check for any damage to the liver.

Primary Sclerosing Cholangitis (PSC)

PSC is a rarer condition in which chronic inflammation causes scarring, and narrowing, of the bile ducts. Unlike PBC, PSC can affect bile ducts of any size, both inside and outside the liver. Over time, PSC may progress to chronic liver disease, though not everyone with PSC goes on to develop this.

What Causes PSC?

The exact cause of PSC is not yet known, though research points to a combination of immune system factors, genetics and gut bacteria. PSC is diagnosed at an average age of around 40, although it can occur at any age, including in childhood, and it is roughly twice as common in men as in women. A first-degree relative of someone with PSC has a small increase in their own risk of developing the condition.

Symptoms of PSC

Many people with PSC have no symptoms, particularly early on, and the condition is often picked up when a routine blood test shows abnormal liver function in someone who has inflammatory bowel disease. When symptoms do develop, they tend to appear gradually and can include itchy skin, fatigue and jaundice. Abdominal pain accompanied by fever or chills can be a sign that an infection has developed in the bile ducts and should be assessed urgently.

How Is PSC Diagnosed?

Diagnosis usually begins with blood tests, which often show a raised ALP level. The key imaging test is MRCP, a specialised MRI scan that looks closely at the bile ducts for the narrowing characteristic of PSC. A liver biopsy is occasionally needed as well, particularly if there is any uncertainty about the diagnosis.

PSC and Inflammatory Bowel Disease

PSC has a strong link with inflammatory bowel disease, and around three-quarters of people with PSC have or will go on to develop this, most often ulcerative colitis and less often Crohn’s disease. Because of this, anyone newly diagnosed with PSC is generally offered a colonoscopy to check for IBD, even if they have no bowel symptoms. If you already have a diagnosis of Crohn’s disease or ulcerative colitis, it is worth mentioning any new symptoms such as itchy skin or jaundice to your gastroenterologist.

Bile Duct Strictures and Cholangitis in PSC

The scarring seen in PSC causes strictures, narrowed sections of the bile duct that restrict the flow of bile. You can read more about how strictures form and are treated on our bile duct obstruction page. If a stricture becomes blocked and the trapped bile becomes infected, this is called cholangitis, and it typically causes jaundice together with abdominal pain and fever or chills. Cholangitis needs prompt antibiotic treatment, and sometimes a procedure called ERCP is required to relieve the blockage.

Treatment Options

Managing PBC

There is no cure for PBC, but treatment can slow its progression and ease symptoms. The standard first-line treatment is a bile acid medication, ursodeoxycholic acid, which improves liver test results for most people and is usually taken indefinitely. If this medication is not well tolerated, or does not work well enough after extended use, your gastroenterologist may discuss other medication options with you.

Managing PSC

Unfortunately, there is currently no medication proven to slow the progression of PSC itself. A bile acid medication is sometimes used, as it can improve liver test results, though its effect on long-term outcomes is less clear than it is for PBC. Ongoing research, including clinical trials in Australia, continues to look for more effective treatments, and your gastroenterologist can discuss whether a clinical trial might be suitable for you.

Supportive Care for Both Conditions

Alongside disease-specific treatment, both conditions are managed with supportive care. Itchy skin can be eased with dedicated itch-relieving medication, and simple measures such as wearing natural fibres, avoiding very hot baths, and moisturising regularly can also help. Because both conditions increase the risk of thinning bones, a bone density scan is often recommended, along with vitamin D and calcium supplementation and regular weight-bearing exercise. General health advice includes keeping up to date with vaccinations, limiting alcohol intake, and eating a nutritious diet.

Monitoring for Complications and Cancer Risk

Both PBC and PSC are lifelong conditions that need ongoing monitoring by a specialist, even when you are feeling well. In more advanced disease, scarring of the liver can lead to complications such as a build-up of fluid in the abdomen, changes in mental clarity from a build-up of toxins, or enlarged blood vessels in the food pipe that carry a risk of bleeding. These complications are managed with a combination of medication and regular endoscopy, and your gastroenterologist will tailor monitoring to your individual situation.

People with PSC also carry a higher lifetime risk of certain cancers, particularly cancer of the bile ducts, which affects up to around one in ten people with PSC over a ten-year period, along with a smaller increase in the risk of gallbladder and bowel cancer, especially where PSC occurs alongside inflammatory bowel disease. This is why regular surveillance, which may include yearly imaging of the bile ducts, an annual ultrasound of the gallbladder, and more frequent colonoscopies if you also have IBD, is recommended. In PBC, the main additional cancer risk relates to the liver itself and mainly applies to those who have developed cirrhosis, for whom six-monthly liver ultrasound is generally recommended. These are population-level figures rather than a prediction for any individual, and the purpose of surveillance is to identify any changes early, when they are most treatable. Your gastroenterologist can talk you through what this monitoring means for your specific situation.

Prognosis and Living with Autoimmune Liver Disease

The outlook for both PBC and PSC varies significantly between individuals, and lifelong follow-up with a liver specialist is recommended for everyone diagnosed with either condition. For PBC, the availability of effective bile acid treatment means many people with early-stage disease have a normal life expectancy, and those whose liver test results return to normal on treatment tend to have a particularly good outlook. PSC follows a more variable course. Some people remain well for many years, while others progress more quickly, and on average, complications tend to develop ten to twenty years after diagnosis in those who experience them. Neither condition can currently be cured, but with regular monitoring and treatment, many people continue to live full and active lives. It is also common to feel some anxiety after a diagnosis like this, and looking after your mental wellbeing, including reaching out to a support group such as PSC Support Australia, is a valid and worthwhile part of your care.

When to See a Gastroenterologist

If your GP has found abnormal liver function test results, particularly a raised ALP level, or if you have symptoms such as persistent itching, fatigue or jaundice that don’t have another clear explanation, ask about a referral to Queensland Gastroenterology for further assessment. If you already have a diagnosis of Crohn’s disease or ulcerative colitis and develop new symptoms of this kind, it is worth raising this with your gastroenterologist at your next review. Our specialists work closely with your GP, and where needed, hepatology and surgical colleagues, to coordinate ongoing care for autoimmune liver disease.

If you have received a referral to see one of our doctors, you can request an appointment, or contact our rooms directly on (07) 3321 1500.

References

This information has been adapted from the following sources, as at 6/08/2026. It is intended for general patient education and does not replace individual medical advice from your GP or gastroenterologist.

Better Health Channel, Victorian Department of Health. Primary biliary cirrhosis [primary biliary cholangitis]. Reviewed 21 May 2020.

Gastroenterological Society of Australia (GESA). Primary Sclerosing Cholangitis (PSC) [patient information factsheet]. Created 2022.

Gastroenterological Society of Australia (GESA). Primary Biliary Cholangitis (PBC) [patient information factsheet]. Created 2024.