Primary Biliary Cholangitis
An autoimmune disease that slowly damages the liver's bile ducts
Quick Facts
- Type: Chronic autoimmune liver disease
- What it affects: Small bile ducts inside the liver
- Common signs: Fatigue, itching, dry eyes and mouth
- Who it affects: Most often middle-aged women
Overview
Primary biliary cholangitis (PBC), formerly called primary biliary cirrhosis, is a long-term autoimmune disease that affects the liver. In PBC, the immune system mistakenly attacks the small bile ducts inside the liver. These ducts carry bile, a fluid that helps digest fats and remove waste, out of the liver. As the ducts are damaged, bile builds up and gradually injures liver cells.
Over many years, this ongoing damage can lead to scarring of the liver (fibrosis) and, in advanced cases, cirrhosis. PBC progresses slowly, and many people are diagnosed before they have symptoms, often after a routine blood test shows abnormal liver results. With modern treatment, many people with PBC have a normal or near-normal life expectancy, especially when the disease is found and treated early.
Symptoms
In the early stages, many people have no symptoms. When symptoms do appear, they often include:
- Fatigue, which can be significant and is one of the most common complaints
- Itchy skin (pruritus), sometimes intense
- Dry eyes and dry mouth
- Pain or discomfort in the upper right abdomen
- Yellowing of the skin and eyes (jaundice) in more advanced disease
- Darkening of the skin
- Small yellow deposits of cholesterol around the eyes or on the skin
As the disease advances, complications of liver scarring can develop, such as fluid buildup in the abdomen, swelling in the legs, and bone thinning. Symptoms like confusion, vomiting blood, or significant jaundice signal advanced liver disease and need prompt medical attention.
Causes
PBC is an autoimmune condition, meaning the immune system attacks the body's own tissues, in this case the small bile ducts in the liver. The exact reason this happens is not fully understood, but it is thought to involve a combination of:
- Genetic factors: A tendency toward autoimmune disease that can run in families.
- Environmental triggers: Possible triggers such as infections or chemical exposures that set off the immune reaction in susceptible people.
PBC is not caused by alcohol and is not contagious. It is not directly inherited in a simple way, although having a close relative with PBC or another autoimmune disease slightly raises the risk.
Risk Factors
- Being a woman, as PBC is much more common in women
- Being middle-aged, typically diagnosed between the ages of 40 and 60
- A family history of PBC or other autoimmune diseases
- Having another autoimmune condition, such as Sjogren syndrome or thyroid disease
- Certain genetic and environmental factors
Diagnosis
PBC is often discovered through blood tests done for other reasons. Diagnosis usually involves:
- Liver blood tests: Showing a particular pattern of elevated liver enzymes that points to bile duct injury.
- Antibody testing: A blood test for antimitochondrial antibodies (AMA), which are present in most people with PBC and strongly support the diagnosis.
- Imaging: Ultrasound or other scans to look at the liver and bile ducts and rule out blockages.
- Liver biopsy: Occasionally used to confirm the diagnosis or assess how advanced the disease is.
Treatment
There is no cure, but treatment can slow the disease, relieve symptoms, and protect the liver:
- Medication to slow progression: Ursodeoxycholic acid (a bile acid) is the standard first treatment and can slow liver damage, especially when started early. Additional medications may be added if it is not enough.
- Symptom relief: Treatments for itching, dry eyes and mouth, and fatigue.
- Protecting bone and overall health: Monitoring and treating bone thinning, cholesterol, and vitamin deficiencies.
- Managing complications: Treating problems related to advanced liver disease as they arise.
- Liver transplant: Considered for advanced disease or liver failure that does not respond to treatment.
Regular follow-up with a liver specialist helps track the disease and adjust treatment over time.
Prevention
Because the exact cause is unknown, PBC cannot currently be prevented. However, people with PBC can protect their liver and overall health by:
- Taking prescribed medications consistently
- Avoiding alcohol or using it only as advised by a doctor
- Keeping vaccinations against hepatitis A and B up to date as recommended
- Eating a balanced diet and staying physically active to support bone and general health
- Attending regular follow-up appointments and blood tests
When to See a Doctor
See a doctor if you have persistent fatigue, ongoing itchy skin, or yellowing of the skin or eyes, or if routine blood tests show abnormal liver results. If you have been diagnosed with PBC, seek prompt care for signs of advancing liver disease, including:
- Significant or worsening jaundice
- Swelling of the abdomen or legs
- Confusion or unusual drowsiness
- Vomiting blood or passing black, tarry stools
These can indicate serious complications that need urgent treatment.
Frequently Asked Questions
Is primary biliary cholangitis the same as cirrhosis?
No. PBC was once called primary biliary cirrhosis, but the name was changed because most people do not have cirrhosis when diagnosed. PBC is the autoimmune disease that damages bile ducts; cirrhosis is advanced scarring that can develop later if the disease progresses.
What causes PBC?
PBC is an autoimmune disease in which the immune system attacks the liver's small bile ducts. The exact trigger is unknown but likely involves a mix of genetic and environmental factors. It is not caused by alcohol and is not contagious.
Can PBC be cured?
There is no cure, but treatment with ursodeoxycholic acid and, when needed, additional medications can slow the disease and protect the liver, especially when started early. Many people with PBC have a normal or near-normal life expectancy.
Who gets primary biliary cholangitis?
PBC most often affects women between the ages of 40 and 60. Having a family history of PBC or another autoimmune disease, or having a condition such as Sjogren syndrome or thyroid disease, raises the risk.
What are the early signs of PBC?
Many people have no symptoms at first and are diagnosed after a routine blood test. When symptoms appear, fatigue and itchy skin are among the most common, sometimes along with dry eyes and mouth.
References
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Primary biliary cholangitis.
- Mayo Clinic. Primary biliary cholangitis — Symptoms and causes.
- MedlinePlus, U.S. National Library of Medicine. Primary biliary cholangitis.
- American Liver Foundation. Primary biliary cholangitis (PBC).