Liver fibrosis

Liver fibrosis is a condition in which the liver is damaged again and again over time, leading to the gradual buildup of scar tissue. This damage is most often caused by conditions such as steatotic liver disease, heavy alcohol use or chronic viral hepatitis. As scar tissue replaces healthy liver tissue, the liver becomes less flexible and its ability to function may begin to decline. Fibrosis develops throughout the whole liver over time rather than forming a lump or growth such as a tumor or cancer.

If the cause of liver injury is not treated or controlled, fibrosis can progress and eventually lead to cirrhosis, a more advanced stage of liver disease in which extensive scarring causes lasting changes to the liver's structure and function. Cirrhosis can result in serious complications, including liver failure and a higher risk of liver cancer.

Hearing the term "liver fibrosis" can cause worry. Although fibrosis reflects liver damage over time, it does not always mean the damage is permanent. Evidence shows that early stages of fibrosis may stabilize or improve when the underlying cause of liver injury is found and treated.

Liver fibrosis itself usually does not cause symptoms, especially in the early stages. Many people with fibrosis feel well and do not know they have liver scarring until it is found during blood tests or imaging done for another reason.

When symptoms are present, they are often related to the condition causing liver injury, such as steatotic liver disease, alcohol-related liver disease or chronic viral hepatitis, rather than the scarring itself.

Symptoms that reflect worsening liver function or complications of advanced liver disease may include:

• Yellowing of the skin or eyes, called jaundice.
• Fluid buildup in the abdomen, called ascites.
• Swelling in the legs, feet or ankles, called edema.
• Confusion, trouble concentrating or changes in alertness, known as hepatic encephalopathy.

The presence of these symptoms may indicate a lot of liver damage and should be checked by a healthcare professional right away.

When to see a doctor

Make an appointment with a healthcare professional if you have any of the symptoms of liver fibrosis.

Liver fibrosis happens as a result of ongoing inflammation and injury in the liver. This damage activates the body's wound-healing response. When liver injury continues over time, scar tissue forms and slowly replaces healthy liver tissue. This process is driven by chronic liver disease rather than a single episode of liver damage.

In developed countries, the most common causes of liver fibrosis are conditions related to metabolic health, including metabolic dysfunction-associated steatotic liver disease linked to obesity, type 2 diabetes and insulin resistance. Heavy or long-term alcohol use is another leading cause of ongoing liver injury and fibrosis.

Chronic viral hepatitis also can lead to liver fibrosis. Hepatitis B remains a common cause of fibrosis worldwide, particularly in regions where the condition happens early in life. Hepatitis C, once a major cause of liver fibrosis, is now almost universally curable with antiviral treatment when found and treated early.

Other, less common causes of liver fibrosis include autoimmune liver diseases, inherited liver conditions, and diseases that damage or block the bile ducts. If the cause of liver injury is not treated or controlled, scar tissue can continue to build up and fibrosis may worsen over time.

Risk factors are conditions or behaviors that increase the chance of developing liver fibrosis or make liver damage more likely to get worse.

Factors associated with a higher risk of liver fibrosis include:

• Having too much body weight or metabolic conditions, such as obesity, insulin resistance and type 2 diabetes, which are strongly linked to metabolic dysfunction-associated steatotic liver disease.
• Heavy or long-term alcohol use, which can cause ongoing liver inflammation and injury.
• Chronic viral hepatitis, such as hepatitis B or hepatitis C.
• Autoimmune liver diseases, in which the immune system attacks the liver. An example is autoimmune hepatitis.
• Diseases that damage or block bile ducts, such as primary biliary cholangitis and primary sclerosing cholangitis.
• Inherited liver diseases, such as hemochromatosis, Wilson's disease and alpha-1 antitrypsin deficiency.
• Age and sex. Men older than 50 and postmenopausal women have a higher risk of progressive fibrosis and related complications.

Having more than one risk factor can increase the likelihood that liver fibrosis will happen or get worse.

Liver fibrosis increases the risk of long-term liver issues if scarring continues to worsen over time. Complications are not common in early fibrosis and are more likely to occur when fibrosis becomes advanced or changes to cirrhosis.

As healthy liver tissue is slowly replaced by scar tissue, the liver may become less able to carry out its regular functions. In the earlier stages, this decline in function may be hard to notice and is often found with blood tests rather than through symptoms. Over time, impaired liver function can affect how the body processes medicines, regulates blood components and clears toxins from the bloodstream.

When fibrosis changes to cirrhosis, more-serious complications can occur, including:

• Reduced blood flow through the liver, which can raise pressure in a blood vessel called the portal vein. This condition is called portal hypertension.
• Fluid buildup in the abdomen, called ascites.
• Bleeding, which may occur when portal hypertension causes enlarged veins, called varices, to burst.
• Confusion or trouble thinking clearly, known as hepatic encephalopathy. It is caused by the buildup of toxins the liver can no longer clear effectively.
• Liver failure, which occurs when the liver can no longer carry out its vital functions.
• Increased risk of liver cancer.

Finding conditions that cause liver injury early and treating them can help reduce the risk of worse complications.

Liver fibrosis may be prevented or slowed by reducing ongoing liver damage and treating liver disease early. Addressing risk factors before a lot of scarring develops can help protect liver health and reduce the likelihood of advanced liver disease.

These steps may help prevent liver fibrosis:

• Treat liver disease early. Early evaluation and management can reduce long-term inflammation and scarring.
• Avoid alcohol. Alcohol can worsen liver damage, especially in people with existing liver disease.
• Maintain a healthy body weight. Managing body weight may lower the risk of steatotic liver disease and ongoing liver inflammation. A healthcare professional can help develop a safe and effective weight management plan.
• Eat a healthy diet. Choose a diet rich in fruits, vegetables and whole grains, with lean sources of protein. Limit fatty and fried foods.
• Manage long-term health conditions. Conditions such as type 2 diabetes and high cholesterol can contribute to liver inflammation if not well managed.
• Prevent viral hepatitis. Getting vaccinated for hepatitis B and reducing exposure to all hepatitis viruses can help protect the liver.
• Keep regular follow-up appointments. Ongoing monitoring allows healthcare professionals to track liver health and adjust care as needed.

Healthcare professionals diagnose liver fibrosis by reviewing medical history, doing a physical exam and using tests to look for signs of liver damage and scarring. Because early fibrosis often causes no symptoms, testing is usually done based on risk factors or test results outside of the standard range rather than symptoms alone.

Tests used to diagnose or evaluate liver fibrosis may include:

• Blood tests. These tests can find signs of liver injury or inflammation and help identify the cause of liver disease. Blood tests also may screen for viral hepatitis and measure substances linked to liver health. Some blood-based scoring tools combine test results to estimate the likelihood or severity of liver scarring.
• Imaging tests that measure liver stiffness. These tests estimate how much scar tissue is present in the liver. Tests include magnetic resonance elastography (MRE), and ultrasound-based elastography. They are noninvasive alternatives to liver biopsy. Fibrosis affects liver tissue more evenly rather than forming a lump or spot. Fibrosis usually does not appear as a specific scar, mass or lesion on an image.
• Standard imaging tests. MRI, CT and ultrasound may be used to look for signs of chronic liver disease or related complications. These tests are less accurate for detecting early fibrosis.
• Liver biopsy. This procedure removes a small sample of liver tissue for testing. A biopsy is not routinely needed to diagnose liver fibrosis since noninvasive blood and imaging tests can be used. But biopsy may still be used in certain situations when results of other tests are unclear.

Liver fibrosis does not have a single treatment. Instead, care focuses on treating the cause of liver injury and reducing factors that continue to damage the liver.

Treating the underlying cause

Metabolic-associated conditions

Management focuses on improving metabolic health in people with metabolic-associated steatotic liver disease (MASLD). This condition is commonly linked to excess body weight, insulin resistance and type 2 diabetes. A more severe form, metabolic-associated steatohepatitis (MASH), involves liver inflammation and can lead to fibrosis.

Weight loss, improved nutrition and regular physical activity can reduce liver inflammation and may slow or improve fibrosis. Depending on your situation, treating related conditions such as high cholesterol and high blood pressure also may be part of care. For some people, weight-loss medicines or weight-loss surgery may be part of a comprehensive weight management approach.

Alcohol-related liver disease

Stopping alcohol use is the most important step in preventing further liver damage. Support programs, counseling and medical treatment may help people reduce or stop drinking. Continued alcohol use increases the risk that fibrosis will worsen and change to cirrhosis.

Viral hepatitis

Antiviral medicines are used to treat hepatitis B and hepatitis C. Effective treatment can lessen ongoing liver inflammation and lower the risk that fibrosis will worsen. Hepatitis C is often curable with modern antiviral therapy when diagnosed and treated early.

Liver and bile duct conditions

Medicines that affect immune system activity may be used to control inflammation in conditions such as autoimmune hepatitis, primary biliary cholangitis and primary sclerosing cholangitis. Treatment plans are individualized and typically guided by specialists.

Potential future treatments

Researchers are studying new ways to slow, stop or possibly reverse liver scarring by targeting the processes that cause fibrosis. These approaches include medicines and cell-based therapies designed to reduce inflammation, limit scar tissue formation or support liver repair.

Other research is exploring how interactions among liver cells, the immune system and gut bacteria may affect whether fibrosis worsens. These treatments are still being studied and are not part of standard care.

The outlook for liver fibrosis varies widely and depends on the cause of liver disease, the amount of scarring present and how early treatment begins.

In many people, liver fibrosis worsens slowly and may remain stable for years. When the cause of liver injury is found and treated early, fibrosis may stop worsening and, in some people, partially improve. This is especially true when risk factors such as excess body weight, type 2 diabetes or alcohol use are effectively managed.

Advanced fibrosis carries a higher risk of worsening to cirrhosis and related complications. Once cirrhosis develops, lasting changes can occur to the liver's structure and function, increasing the risk of liver failure and liver cancer.

Because liver fibrosis often causes few or no symptoms, ongoing monitoring is important, even when you feel well. Healthcare professionals may use blood tests and imaging over time to assess liver health and guide care. Early intervention and regular follow-up play a key role in improving long-term outcomes.

Most people with liver fibrosis do not need a liver transplant. However, if liver disease worsens to advanced liver failure despite treatment, specialized care may be needed. In some people with end-stage liver disease, liver transplant may be considered.

Self-care plays an important role in protecting liver health and slowing the worsening of liver fibrosis. Healthcare professionals may recommend specific self-care steps based on overall health and the cause of liver disease.

These steps may help support liver health:

• Avoid alcohol. Even in small amounts, alcohol can worsen liver damage. If avoiding alcohol is hard, ask a healthcare professional about support programs or treatment options.
• Follow a balanced diet. Eating a nutritious diet may help support overall health and manage conditions linked to liver disease, such as obesity or diabetes. A healthcare professional may recommend specific nutrition guidance.
• Be physically active as tolerated. Regular physical activity may help manage body weight and metabolic health. A healthcare professional can help determine safe activity levels.
• Manage long-term health conditions. Managing conditions such as diabetes may help protect liver health. Take medicines as prescribed and attend regular follow-up visits.
• Avoid medicines and supplements that can affect the liver. Some medicines and herbal supplements can harm the liver. Talk with a healthcare professional before starting new medicines or supplements.
• Prevent infections. Staying up to date on recommended vaccinations and taking steps to reduce exposure to hepatitis viruses may help protect the liver.
• Keep follow-up appointments. Regular monitoring with blood tests and imaging tests helps track liver health and detect changes early.

If you have liver fibrosis, you may be referred to a doctor who specializes in the digestive system, called a gastroenterologist, or a doctor who is an expert in conditions of the liver, called a hepatologist.

Here's some information to help you get ready for your appointment and know what to expect.

What you can do

• Be aware of anything you need to do ahead of time, such as stop eating or drinking before blood tests or imaging tests.
• Write down any symptoms you have noticed, even if they seem mild. Include when they started and whether they have changed over time.
• Make a list of all medicines you take, including prescription medicines and medicines, vitamins and supplements you buy without a prescription. Include the doses.
• Write down your key medical information, including other health conditions such as diabetes or viral hepatitis.
• Bring copies of recent test results, including the results of blood tests or imaging tests such as ultrasound, CT or MRI scans, if available.
• Write down key personal information, including recent life changes or sources of stress.
• Think about bringing a family member or friend to help you remember information you get during the visit.
• Write down questions to ask your healthcare professional.

Questions to ask your doctor

Preparing a list of questions can help you make the most of your time. Basic questions may include:

• What is most likely causing my liver fibrosis?
• How advanced is my liver scarring?
• Can liver fibrosis be slowed or improved in my case?
• What treatment or monitoring do you recommend?
• Are there medicines or supplements that could worsen liver damage?
• How often will I need follow-up tests?
• What symptoms should prompt me to seek medical care?
• How can I best manage other health conditions along with liver disease?

Feel free to ask any additional questions during your appointment.

What to expect from your doctor

Be prepared to answer questions, such as:

• Have you noticed any symptoms, and if so, when did they start?
• Do you drink alcohol, and if so, how often?
• Do you take any prescription or nonprescription medicines, supplements or herbal products?
• Have you ever been diagnosed with viral hepatitis?
• Do you have other medical conditions, such as diabetes or obesity?
• Is there a family history of liver disease or inherited liver conditions?
• Have you ever had liver blood test or imaging test results that were outside of the standard range?

Healthcare professionals often describe liver fibrosis in stages based on how much scar tissue is present in the liver. These stages help estimate how severe the scarring is and how likely the disease is to worsen over time.

Liver fibrosis is commonly described using stages from F0 to F4.

• F0 means there is no liver scarring.
• F1 means mild scarring is present but the liver structure is mostly preserved.
• F2 means moderate scarring has begun to occur within the liver.
• F3 means advanced scarring that affects larger areas of the liver and disrupts blood flow.
• F4 means cirrhosis, the most severe stage, in which extensive scarring causes lasting damage to the liver.