Introduction
Autoimmune hepatitis (AIH) is a chronic inflammatory liver disease in which the immune system attacks hepatocytes. Persistent inflammation raises liver enzymes, can cause jaundice and fatigue, and may progress to fibrosis, cirrhosis, or liver failure if untreated.
AIH is classified mainly as type 1 (usually ANA and/or smooth-muscle antibodies; more common in adults) and type 2 (anti-LKM1 or anti-LC1; more often in children and adolescents). Women are affected several times more often than men, though anyone can develop AIH.
Unlike viral hepatitis or alcohol-related liver disease, AIH is driven by loss of immune tolerance rather than infection or toxin load alone. Genetic predisposition, environmental triggers, medicines, and other autoimmune diseases may contribute.
Corticosteroids with or without azathioprine induce and maintain remission in many patients. Liver transplant is reserved for end-stage disease. This page is general education; personal care plans come from a clinician.
Overview
AIH presents with hepatitis of varying severity—from silent enzyme elevation to acute liver failure. Diagnosis uses a combination of autoantibodies, immunoglobulin levels, exclusion of viral and toxic causes, and often liver biopsy.
Prevalence estimates are roughly in the low tens per 100,000 in some Western populations and lower in parts of Asia; it accounts for a meaningful share of chronic liver disease in specialised centres.
With early immunosuppression, many people achieve biochemical remission and preserve liver function; untreated disease risks cirrhosis, hepatocellular carcinoma in cirrhotic livers, and transplant need.
- Immune-mediated chronic hepatitis with autoantibodies and interface hepatitis on biopsy
- Type 1 and type 2 serologic patterns guide classification
- More common in women; can occur at any age
- Must be distinguished from viral, alcoholic, drug-induced, and metabolic liver disease
- Steroids ± azathioprine are standard induction/maintenance tools
- Transplant for decompensated end-stage liver disease
What happens in the body
Loss of tolerance allows T cells and autoantibodies (ANA, SMA, anti-LKM1, anti-SLA/LP, and others) to target liver-cell antigens. Lymphocytic inflammation injures hepatocytes, elevates transaminases, and impairs bilirubin handling and protein synthesis.
Ongoing injury activates stellate cells and lays down scar (fibrosis). Advanced fibrosis becomes cirrhosis with portal hypertension, ascites, varices, and encephalopathy. Acute severe flares can precipitate acute or acute-on-chronic liver failure.
- Autoreactive immune attack on hepatocytes → necroinflammation
- Fibrosis accumulates with uncontrolled disease
- Cirrhosis and portal hypertension are late structural outcomes
- Extrahepatic autoimmune disease may coexist
Signs and symptoms
Some people are asymptomatic for long periods; others present abruptly. Common possibilities include:
- Fatigue that does not improve with rest
- Jaundice (yellow skin or eyes)
- Discomfort in the right upper abdomen
- Poor appetite, nausea, or vomiting
- Joint pain or aching
- Dark urine and pale stools
- Itching, rashes, or spider-like blood vessels on the skin
- Advanced signs: ascites, leg swelling, easy bruising, confusion (encephalopathy)
Causes and risk factors
Cause is multifactorial. Clinicians weigh these contributors:
- Genetic predisposition and family history of autoimmunity
- Female sex as a strong epidemiologic risk marker
- Other autoimmune diseases (thyroid disease, rheumatoid arthritis, coeliac disease, and others)
- Possible triggers: viral infections, certain medicines, or toxins in susceptible people
- Type 2 AIH predominance in children and adolescents
- Non-modifiable factors: age at onset and inherited immune risk
- Modifiable supports: avoiding alcohol and unnecessary hepatotoxins once diagnosed
- Ethnic and regional variation in recognition and reported prevalence
Diagnosis and evaluation
Work-up confirms AIH, grades severity, and excludes look-alikes:
- History of symptoms, medicines, alcohol, and autoimmune disease; family history
- Exam for jaundice, hepatomegaly, ascites, and extrahepatic autoimmune signs
- Liver enzymes, bilirubin, albumin, INR, and full blood count
- Autoantibodies (ANA, SMA, anti-LKM1, anti-SLA/LP as indicated) and IgG level
- Viral hepatitis serologies; consider Wilson disease, PBC, PSC, NAFLD, and DILI
- Ultrasound (± CT/MRI); FibroScan for stiffness; liver biopsy for confirmation and staging
- Scoring systems (simplified IAIHG) and METAVIR/Ishak histology to guide intensity of care
Treatment and management
Therapy aims for biochemical and histologic remission while limiting steroid toxicity:
- Induction with prednisolone (or budesonide in selected non-cirrhotic patients)
- Azathioprine for steroid-sparing maintenance when appropriate (TPMT considerations)
- Second-line options (mycophenolate, mercaptopurine, tacrolimus, or other agents) for intolerance or non-response under specialist care
- Bone protection (calcium, vitamin D) and infection/vaccine planning on immunosuppression
- Strict alcohol avoidance; balanced diet; caution with raw shellfish when immunosuppressed
- Liver transplant for end-stage cirrhosis or acute liver failure unresponsive to medical therapy
- Regular LFTs and clinical review to detect relapse early
Prevention, self-care, and lifestyle
Not every condition is fully preventable, but the steps below may lower risk or recurrence:
- AIH itself is not reliably preventable
- Avoid alcohol and known hepatotoxic exposures after diagnosis
- Maintain vaccination status as advised while immunosuppressed
- Treat concurrent autoimmune disease and metabolic risks
- Keep scheduled liver-test monitoring even when you feel well
- Report new medicines or supplements before starting them
Possible complications
Delay, missed care, or unsafe self-medication can raise the chance of complications in some cases:
- Progressive fibrosis and cirrhosis
- Portal hypertension: variceal bleeding, ascites, encephalopathy
- Acute liver failure in severe flares
- Hepatocellular carcinoma risk once cirrhosis is established—surveillance imaging when indicated
- Infections related to immunosuppressive therapy
- Impaired quality of life from fatigue, mood strain, and treatment side effects
When to see a doctor or seek emergency care
Seek prompt medical advice or emergency care if any of the following apply—it is safer not to wait and see:
- Persistent fatigue with abnormal liver tests or jaundice
- New abdominal swelling, black stools, vomiting blood, or confusion—urgent/emergency care
- Rapidly deepening jaundice or severe right-upper-quadrant pain
- Fever while on steroids or other immunosuppressants
- Planning pregnancy on AIH therapy—needs specialist advice
- Relapse symptoms after tapering treatment
Living with the condition
Adherence to induction and maintenance medicines is the strongest everyday determinant of remission. Do not stop steroids abruptly.
Pace activity, eat regularly, and avoid alcohol. Ask about bone health, eye checks with long-term steroids, and safe exercise.
Carry a medication list; plan travel with enough supply and knowledge of local urgent-care options for jaundice or bleeding.
Frequently asked questions
What is autoimmune hepatitis?
It is a chronic liver disease in which the immune system attacks liver cells, causing inflammation that can progress to scarring if untreated.
Is autoimmune hepatitis serious?
Yes. Untreated AIH can lead to cirrhosis, liver failure, or liver cancer in cirrhotic patients. Early treatment greatly improves outlook.
Is it curable?
AIH is usually managed rather than permanently cured. Many people achieve long remissions on treatment; some relapse when therapy is withdrawn.
What causes it?
Exact causes are unclear. Genetics, sex-related immune factors, other autoimmune diseases, and possible environmental or drug triggers interact.
How is it treated?
Standard care uses corticosteroids with or without azathioprine. Other immunosuppressants or transplant are considered for difficult or end-stage disease.
When is emergency care needed?
Seek emergency care for severe abdominal pain, rapidly worsening jaundice, confusion, vomiting blood, black stools, or marked swelling with distress.
Important caution
This article is for general health education only. It is not personal medical advice or a substitute for hepatology review.
Immunosuppressant choice, biopsy decisions, and transplant referral must be individualised by a qualified clinician.
If signs of liver failure or gastrointestinal bleeding appear, seek emergency care without delay.