Acute liver failure: a case-based approach

The presentation

Imagine an adult who, over a few days, feels increasingly sick and tired, goes off their food, and notices their skin and the whites of their eyes turning yellow — a sign called jaundice. Their urine looks dark and they may feel pain under the right ribs. What marks this out as more than a simple tummy bug is a change in thinking: they become muddled, unusually sleepy, or behave out of character. This confusion, called hepatic encephalopathy, happens because a failing liver can no longer clear toxins from the blood, and those toxins affect the brain. Jaundice plus new confusion in someone who was previously well is a red-flag combination that needs urgent hospital assessment, because the liver may be failing fast.

Why it is so dangerous

The liver does dozens of essential jobs: it clears toxins, makes proteins that help blood to clot, balances blood sugar, and processes medicines. When it fails suddenly, several of these fail together. Toxins build up and cloud the brain; clotting proteins drop, so bleeding becomes a risk; blood sugar can fall; and the whole body can become inflamed, affecting the kidneys, circulation and lungs. In the most severe cases the brain can swell. Because so many systems are involved at once, acute liver failure can deteriorate rapidly, sometimes within hours. Common causes include an overdose of paracetamol, certain infections, some reactions to medicines or herbal products, and less common liver conditions. The key point for the public is that early recognition and getting to hospital quickly can be life-saving.

When to seek emergency help

This is the most important part. If someone develops yellowing of the skin or eyes together with confusion, unusual drowsiness, slurred speech or behaving out of character, treat it as an emergency and call 999 or go to the nearest A&E — do not wait to see if it settles. The same applies if you know or suspect a paracetamol overdose has been taken, even if the person seems well and has no symptoms yet, because the liver damage can be silent at first and treatment works best when started early. Never wait for symptoms after a suspected overdose. If someone becomes very drowsy, hard to rouse, starts vomiting blood, or has a fit, call 999 immediately. Time genuinely matters in liver failure.

What happens in hospital

In hospital the team check breathing, circulation and conscious level, take blood tests that show how well the liver is working and clotting, and look for the cause. If paracetamol is involved, a specific antidote can protect the liver and is given without delay when indicated — this is one reason speed matters. Blood sugar, salts and fluids are supported closely, and clotting is monitored. People with severe acute liver failure are looked after in intensive care and are often discussed early with, or transferred to, a specialist liver unit, because they may need very close monitoring of the brain and other organs. In the most serious cases, an emergency liver transplant can be considered. Many people recover well when the cause is treated early and support is prompt.

The safe pathway and prevention

The safe pathway is simple: jaundice with new confusion, or any suspected paracetamol overdose, means urgent hospital assessment now — phone 999 or go to A&E, do not wait. Prevention centres on medicine safety: take paracetamol only at the recommended dose, never combine several products that all contain it, and keep tablets away from children and anyone at risk. Be cautious with unregulated herbal or slimming remedies, some of which can harm the liver, and drink alcohol within sensible limits. Tell your doctor about all medicines and supplements you take. If you have a known liver condition, follow your team's advice and report new confusion, drowsiness or worsening jaundice straight away. Acting early, not waiting, is what protects the liver and the person.