Primary biliary cholangitis (PBC), formerly known as primary biliary cirrhosis, is a chronic liver disease that can slowly worsen over time. Doctors divide PBC into four histologic stages, meaning stages based on what liver tissue looks like under a microscope. Progression to a higher stage may be slowed with proper treatment.

In this article, we’ll discuss the four stages of PBC and the symptoms that may happen as the disease progresses. Symptoms don’t reliably show what stage you have, so it’s important to keep regular follow-up visits and report any changes to your doctor.

Defining the Stages of Primary Biliary Cholangitis

PBC affects every person differently, and symptoms don’t always match the stage. Doctors and researchers use PBC stages to help understand liver changes, guide monitoring, and discuss prognosis (outlook).

🗳️ Did your doctor diagnose you with a stage of PBC? If so, which one?

Stage 1

Stage 2

Stage 3

Stage 4

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Early-stage PBC might not cause any symptoms. Because symptoms can happen at different points, blood tests and other medical tests are important for tracking PBC.

PBC is usually diagnosed when at least two of the following three findings are present:

• Cholestatic blood tests, showing reduced or blocked flow of bile in the liver
• PBC-specific antibodies, or
• Biopsy findings consistent with PBC

A liver biopsy can show the histologic stage, but it’s invasive and isn’t routinely recommended for staging at diagnosis.

Your doctor may use noninvasive tests, such as transient elastography, to check for liver scarring. Imaging tests, such as ultrasound, CT, and MRI, can help rule out other causes of bile duct damage and look for complications.

Stage 1 PBC

PBC is an autoimmune disease — an abnormal immune response that targets the body’s own tissues. If you’re learning about the causes of PBC, it’s important to know that PBC involves immune-mediated injury to the small bile ducts in the liver.

Your body uses the fluid bile to help digest fat. The small bile ducts in your liver carry bile into your small intestine and gallbladder.

Symptoms

Early PBC may not cause symptoms, and liver function may be preserved at this stage. However, blood tests often show cholestasis, or reduced or blocked bile flow, and especially higher alkaline phosphatase (ALP) and gamma-glutamyl transferase (GGT) levels.

Diagnosis

In stage 1 PBC, inflammation is mostly limited to the portal areas of the liver. A liver biopsy may show portal inflammation with or without florid bile duct lesions.

Around 95 percent of people with PBC have antimitochondrial antibodies (AMAs). These immune system proteins are measured with a blood test and can help with getting to a diagnosis.

Stage 2 PBC

As PBC progresses to the second histologic stage, inflammation begins spreading from the portal area to nearby tissues. A biopsy may show interface hepatitis, which means inflammation reaches the edge of the portal area.

Symptoms

Symptoms can happen in stage 2, but they can also happen earlier or later. Because symptoms don’t reliably track histologic stage, PBC stage 2 symptoms can vary from person to person.

Diagnosis

Blood tests may show a cholestatic pattern. High ALP and GGT levels can suggest cholestatic liver injury, but they don’t diagnose PBC by themselves.

Your doctor may combine blood test results, antibody tests, imaging, and sometimes biopsy findings to confirm PBC. If you’re unsure how your test results relate to your stage, ask your doctor to explain what they mean for your care plan.

Stage 3 PBC

In stage 3 PBC, a pathologist may see numerous fibrous septa, or bands of scar tissue, in the liver. This scarring can distort the liver’s structure.

Fibrosis, bile duct loss, and cholestasis don’t always appear at the same time. For that reason, stage 3 doesn’t automatically mean a specific symptom pattern or a predictable level of bile flow blockage.

Symptoms

Fatigue and pruritus, or itchy skin, may happen before or after this stage. Symptom severity doesn’t reliably show disease progression, although people with more advanced disease may have more symptoms.

Pruritus can happen when bile-related substances build up and irritate nerves. Cholestasis can cause severe itching without a rash.

Stage 3 PBC can also be associated with fatigue. Fatigue means extreme tiredness that doesn’t improve with sleep or rest, and it can strongly affect daily life.

Diagnosis

Blood tests often focus on ALP, GGT, bilirubin, and other liver markers. ALT and aspartate aminotransferase (AST) may be normal or mildly elevated, but a marked ALT increase may suggest autoimmune hepatitis overlap.

Bilirubin is a byproduct made from the breakdown of red blood cells. A healthy liver normally processes bilirubin into bile. Elevated bilirubin in PBC generally reflects impaired processing and excretion in more advanced disease.

Stage 4 PBC

The fourth stage of PBC is associated with cirrhosis, or severe liver scarring.

Symptoms

With cirrhosis, the liver has fewer healthy bile ducts and more scar tissue. The bile backup in your liver can lead to cholestasis symptoms, including jaundice and severe itching.

People with jaundice have yellowing of their eyes and skin, which can vary depending on skin tone. In PBC, jaundice is generally a late sign linked with advanced liver disease.

Other PBC stage 4 symptoms are due to disease complications. For example, PBC can lead to portal hypertension, or high blood pressure in the liver’s portal vein.

Cirrhosis and portal hypertension may cause:

• Edema (swelling in the feet and ankles)
• An enlarged spleen or enlarged liver
• Ascites (fluid buildup in the abdomen)
• Varices (swollen veins in the abdomen, stomach or esophagus — the tube connecting the mouth and stomach)

Reduced bile flow can make it harder to absorb fats and fat-soluble vitamins. Other problems, such as high cholesterol, xanthomas, and osteoporosis, may also develop for different reasons related to PBC. These complications can include:

• Vitamin deficiencies in fat-soluble vitamins such as A, D, E, and K
• Osteoporosis (weak or brittle bones)
• Xanthomas (fatty lumps under the skin)
• High lipid (cholesterol) levels
• Weight loss
• Fat in stool

Managing the Progression of Primary Biliary Cholangitis

As your PBC progresses, your doctor may change your care plan. Treatment can help slow disease progression, manage symptoms, and reduce liver damage.

Unfortunately, there’s no cure or way to reverse PBC. Your liver can repair some damage, and liver scarring may improve with effective treatment. However, advanced cirrhosis may not fully go away.

You’ll work closely with your doctor to find the best treatment plan to help slow disease progression and delay or reduce the likelihood of needing a liver transplant. PBC treatments may include bile acid therapy to slow liver damage. Newer medicines called PPAR agonists may be an option. Other medicines can help relieve symptoms such as itching.

You’ll likely need regular checkups and blood tests. Be sure to talk to your doctor if your PBC symptoms change over time. Symptoms can fluctuate and don’t necessarily prove that liver damage is worsening, but your doctor can help identify the cause and recommend treatment.

You can also ask your doctor for other tips to manage your PBC symptoms as your disease progresses. If you’re trying to understand PBC symptom stages, remember that test results and medical follow-up are more reliable than symptoms alone.