saudigastro.com/patients/acute-liver-failure
Category
Serious
Red flags
5
This article is educational and does not replace your doctor's advice. Seek urgent care for any red-flag symptoms.
What is it?
Acute liver failure means that, over days to a few weeks, the liver loses much of its ability to do its jobs: cleaning the blood, making proteins that help the blood to clot, and processing waste products. It is defined by two things happening together: abnormal blood clotting tests and a change in mental state (called hepatic encephalopathy, which means the brain is affected because toxins build up in the blood). It usually happens in people whose liver was previously healthy. This is a life-threatening emergency that needs care in a hospital, often in an intensive care unit and in a centre that can offer liver transplantation.
How common is it?
Acute liver failure is uncommon. It can affect people of any age, including children and pregnant women, and the causes differ from one region and age group to another. Because it is rare, early recognition by the patient, family and first doctor is important.
Why does it happen?
Many different things can injure the liver quickly. Common causes include: an overdose of paracetamol (acetaminophen), including taking too much over a few days; reactions to some prescription medicines, herbal or traditional remedies and supplements; viral hepatitis (especially hepatitis A and E, and sometimes hepatitis B); autoimmune hepatitis; poisoning, for example from some wild mushrooms; reduced blood flow to the liver; pregnancy-related liver conditions; and some rare inherited conditions such as Wilson disease. In a number of patients, no cause is found even after full testing. Finding the cause quickly matters because some causes have a specific antidote or treatment.
Symptoms
- Yellow colour of the skin and whites of the eyes (jaundice)
- Extreme tiredness, weakness and loss of appetite
- Nausea and vomiting, and pain in the upper right of the abdomen
- Dark urine and pale stools
- Confusion, poor concentration, mood or behaviour change, or reversed sleep pattern (sleepy by day, awake at night)
- Easy bruising or bleeding from the gums or nose
- Swelling of the legs or abdomen
Red flags — seek urgent medical care
Confusion, strange behaviour, extreme sleepiness or difficulty waking
The brain may be affected by liver failure. Call emergency services or go to the emergency room NOW.
Yellow eyes or skin that appears over a few days, especially with vomiting or severe tiredness
May be sudden liver injury. Go to the emergency room the same day; do not wait for an appointment.
Vomiting blood, black stools, or bleeding that will not stop
Serious bleeding because the blood is not clotting well. Emergency care is needed immediately.
Taking more paracetamol than directed, even if you feel well
Liver damage can appear late. Go to the emergency room immediately; an antidote works best when given early.
Severe headache with vomiting, or a seizure (fit)
Possible brain swelling, a dangerous complication. Call emergency services.
How is it diagnosed?
Doctors make the diagnosis in hospital using blood tests that check liver injury, blood clotting (INR), blood sugar, kidney function, and acidity of the blood, together with an examination of your mental state. Further tests look for the cause: viral hepatitis tests, paracetamol level, autoimmune markers, a pregnancy test where relevant, and tests for Wilson disease in suitable patients. An ultrasound or other scan checks the blood vessels of the liver. Your doctors will ask carefully about all medicines, herbs, supplements and possible exposures, so please bring everything you take. A liver biopsy is sometimes needed and is done in a special way because of the clotting problem.
What the latest science says
Outcomes have improved over recent decades because of intensive care, earlier use of specific treatments such as N-acetylcysteine in selected patients, and timely referral to transplant centres. Doctors use scoring systems and the cause of the illness to decide who is likely to recover without a transplant and who needs to be listed early. Research continues on liver support devices and other treatments that may buy time.
Outlook — what to expect
Acute liver failure is serious. The outlook depends greatly on the cause, how early treatment starts, and how sick the patient is. Some patients recover fully with supportive care and treatment of the cause, because the liver has a remarkable ability to regenerate. Others need an urgent liver transplant to survive. After recovery, many people return to normal life, and follow-up will depend on the cause. Your medical team can discuss your individual outlook.
Treatment
Habits & Lifestyle
This is an emergency condition: there is no home treatment. Go to the hospital immediately if you suspect it. The points below are about prevention and what to do after recovery.
- Never take more paracetamol than the label or your doctor advises, and check that other cold or pain products do not also contain it.
- Avoid herbal, traditional and bodybuilding supplements unless your doctor agrees; some can injure the liver.
- Do not drink alcohol during recovery unless your liver doctor says it is safe.
- Get vaccinated against hepatitis A and hepatitis B if you are not immune.
- Never eat wild mushrooms unless an expert has identified them as safe.
Diet
In hospital, nutrition is managed by the medical team and may be given through a tube or a vein. After recovery, a healthy diet supports the liver.
- Follow the dietitian plan given at discharge; do not restrict protein unless you are told to.
- Eat regular, balanced meals with enough calories while you regain strength.
- Wash fruit and vegetables well and avoid raw or undercooked shellfish and untreated water, which can carry hepatitis A and E.
- Avoid alcohol and ask before using any juice, herbal tea or supplement.
Medications
Treatment is given in hospital and depends on the cause. Your doctors decide what you need; never treat this at home.
- An antidote called N-acetylcysteine is used for paracetamol poisoning and is sometimes used for other causes.
- Antiviral medicines or other specific treatments may be given when a particular cause is found.
- Supportive treatment protects the brain, kidneys, blood sugar and blood pressure and treats infections.
- Medicines that may harm the liver are stopped. Always tell the team every medicine and supplement you have used.
Procedures & Surgery
Some patients need procedures or organ support in intensive care. Liver transplantation is the definitive treatment for those who cannot recover on their own.
- Close monitoring in intensive care, sometimes with breathing support or kidney support (dialysis).
- Urgent assessment for liver transplantation at a specialist centre when recovery is unlikely without it.
- In some patients, a liver biopsy or special blood tests help to find the cause.
Living with the condition
- Keep follow-up appointments; the liver tests and the cause need to be rechecked after discharge.
- Keep an up-to-date list of your medicines and tell every doctor and pharmacist about this illness.
- Recovery can take weeks; tiredness is common. Return gradually to work and activity.
- Family members may need advice if the cause is infectious or inherited.
Questions to ask your doctor
Save this list or print it before your appointment — doctors appreciate prepared patients.
- What caused my liver to fail, and could it happen again?
- Do I need to be assessed at a liver transplant centre?
- Which medicines and supplements should I avoid in future?
- When will my liver tests be rechecked and how long until I can return to work?
- Do my family members need vaccines or testing?
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Status: Approved for publication by SGA; individual clinician review is ongoing · Published 24/04/2026
For general education only; it does not replace your doctor’s advice. Individual clinician review of this guide is ongoing. SGA clinician? Review this guide