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Autoimmune hepatitis is a chronic—or long lasting—disease in which the body’s immune system attacks the normal components, or cells, of the liver and causes inflammation and liver damage. The immune system normally protects people from infection by identifying and destroying bacteria, viruses, and other potentially harmful foreign substances.
Autoimmune hepatitis is a serious condition that may worsen over time if not treated. Autoimmune hepatitis can lead to cirrhosis and liver failure. Cirrhosis occurs when scar tissue replaces healthy liver tissue and blocks the normal flow of blood through the liver. Liver failure occurs when the liver stops working properly.
Autoimmune diseases are disorders in which the body’s immune system attacks the body’s own cells and organs with proteins called autoantibodies; this process is called autoimmunity.
Drawing of the digestive tract inside the outline of a man’s torso. The liver is labeled.
Autoimmune hepatitis is a chronic disease of the liver.
The body’s immune system normally makes large numbers of proteins called antibodies to help the body fight off infections. In some cases, however, the body makes autoantibodies. Certain environmental triggers can lead to autoimmunity. Environmental triggers are things originating outside the body, such as bacteria, viruses, toxins, and medications.
A combination of autoimmunity, environmental triggers, and a genetic predisposition can lead to autoimmune hepatitis.
Autoimmune hepatitis is more common in females. The disease can occur at any age and affects all ethnic groups.
Autoimmune hepatitis is classified into several types. Type 1 autoimmune hepatitis is the most common form in North America. Type 1 can occur at any age; however, it most often starts in adolescence or young adulthood. About 70 percent of people with type 1 autoimmune hepatitis are female.1
People with type 1 autoimmune hepatitis commonly have other autoimmune disorders, such as:
The most common symptoms of autoimmune hepatitis are
Symptoms of autoimmune hepatitis range from mild to severe. Some people may feel as if they have a mild case of the flu. Others may have no symptoms when a health care provider diagnoses the disease; however, they can develop symptoms later.
A health care provider will make a diagnosis of autoimmune hepatitis based on symptoms, a physical exam, blood tests, and a liver biopsy.
A health care provider performs a physical exam and reviews the person’s health history, including the use of alcohol and medications that can harm the liver. A person usually needs blood tests for an exact diagnosis because a person with autoimmune hepatitis can have the same symptoms as those of other liver diseases or metabolic disorders.
Blood tests. A blood test involves drawing blood at a health care provider’s office or a commercial facility and sending the sample to a lab for analysis. A person will need blood tests for autoantibodies to help distinguish autoimmune hepatitis from other liver diseases that have similar symptoms, such as viral hepatitis, primary biliary cirrhosis, steatohepatitis, or Wilson disease.
Liver biopsy. A liver biopsy is a procedure that involves taking a piece of liver tissue for examination with a microscope for signs of damage or disease. The health care provider may ask the patient to temporarily stop taking certain medications before the liver biopsy. He or she may also ask the patient to fast for 8 hours before the procedure.
During the procedure, the patient lies on a table, right hand resting above the head. A health care provider will apply a local anesthetic to the area where he or she will insert the biopsy needle. If needed, he or she will give sedatives and pain medication. Then, he or she will use a needle to take a small piece of liver tissue, and may use ultrasound, computerized tomography scans, or other imaging techniques to guide the needle. After the biopsy, the patient must lie on the right side for up to 2 hours and is monitored an additional 2 to 4 hours before being sent home.
A health care provider performs a liver biopsy at a hospital or an outpatient center. The liver sample is sent to a pathology lab where the pathologist—a doctor who specializes in diagnosing disease—looks at the tissue with a microscope and sends a report to the patient’s health care provider.
A health care provider can use liver biopsy to diagnose autoimmune hepatitis and determine if cirrhosis is present. People often have cirrhosis at the time they are diagnosed with autoimmune hepatitis. A health care provider can also use liver biopsy to look for changes in the severity of liver damage prior to ending treatment for autoimmune hepatitis.
Treatment for autoimmune hepatitis includes medication to suppress, or slow down, an overactive immune system. Treatment may also include a liver transplant.
Treatment works best when autoimmune hepatitis is diagnosed early. People with autoimmune hepatitis generally respond to standard treatment and the disease can be controlled in most cases. Long-term response to treatment can stop the disease from getting worse and may even reverse some damage to the liver.
