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Health condition · Clinically reviewed

Hepatic encephalopathy, the brain complication of liver disease - and how to keep it under control.

A common but treatable complication of cirrhosis. Find the precipitant, titrate lactulose, add rifaximin - and, where needed, walk the transplant path.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against EASL, AASLD, ISHEN and peer-reviewed hepatology sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK hepatology practice including lactulose titration, rifaximin secondary prevention and transplant pathways.

Key facts

Hepatic encephalopathy at a glance.

The essentials, in plain English - what it is, how it is classified, and the treatments UK hepatologists actually use.

  • What it is

    A neuropsychiatric syndrome caused by liver dysfunction and portosystemic shunting, with toxic metabolites (ammonia, inflammatory mediators, gut-derived toxins) crossing the blood-brain barrier.

  • Types

    Type A (acute liver failure), Type B (portosystemic bypass, including TIPS), Type C (cirrhosis) - Type C is by far the most common.

  • Grades

    Minimal or covert HE (subtle, needs psychometric testing) through overt West Haven grades I to IV, ending in coma.

  • Precipitants

    GI bleeding, infection, electrolyte upset, constipation, dehydration, sedatives and disease progression - almost always identifiable.

  • First-line treatment

    Lactulose titrated to two or three soft stools a day, plus aggressive treatment of the precipitant.

  • Secondary prevention

    Rifaximin added to lactulose after an index episode - NICE-approved and specialist commissioned.

Why this guide matters

Find the trigger, treat the trigger.

HE almost never happens in a vacuum. The three principles below shape everything else on this page - and every good hepatology plan.

  • Precipitants are the story

    GI bleeding, infection, electrolytes, sedatives, dehydration - fix the trigger and most episodes resolve.

  • Lactulose is not optional

    Two to three soft stools a day. It sounds mundane, but it is the single most effective daily intervention.

  • Rifaximin changes recurrence

    After an index episode of overt HE, adding rifaximin cuts the risk of the next one - and cuts hospital admissions.

How the diagnosis is made

From bedside to a clear plan.

The steps a UK hepatology team will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    History and precipitant search

    A structured look for GI bleeding, infection, sedatives, dehydration, constipation and recent changes in liver function.

  2. 02

    Assessing

    Bedside examination

    Asterixis (flapping tremor), fetor hepaticus, jaundice, ascites and other cirrhosis signs, plus a graded mental-state assessment.

  3. 03

    Assessing

    Bloods and septic screen

    FBC, U&Es, LFTs, coagulation, glucose, ammonia (raised but not diagnostic on its own), toxicology and cultures.

  4. 04

    Confirming

    Liver ultrasound and Doppler

    Assesses parenchyma, portal-vein flow, TIPS patency and hepatocellular carcinoma - see our guide to a private ultrasound scan.

  5. 05

    Confirming

    CT brain when needed

    To rule out stroke, subdural haematoma or other structural causes when the picture is atypical.

  6. 06

    Preparing

    Psychometric testing for minimal HE

    PHES or the Stroop test, delivered by specialist neuropsychology, picks up covert HE that a bedside exam misses.

  7. 07

    Preparing

    Hepatology MDT and transplant review

    Recurrent or refractory HE is a trigger for transplant assessment and specialist commissioned care.

Typical timeline: acute review in hours, a settled outpatient plan within weeks.

Symptoms

What hepatic encephalopathy looks like.

The classic West Haven spectrum - from covert cognitive slowing to coma - and the features that mean it is time to escalate.

  • Cognitive impairment

    Slowed thinking, poor concentration and difficulty with everyday tasks - the earliest overt feature.

  • Personality change

    Irritability, disinhibition or apathy - often noticed by family before the patient.

  • Sleep-wake inversion

    Daytime somnolence and night-time restlessness - a classic early sign of Type C HE.

  • Asterixis (flapping tremor)

    A coarse, irregular flap of the outstretched hands - a bedside hallmark of grade II HE.

  • Confusion and disorientation

    Loss of time, place or person - characteristic of grade III overt HE.

  • Somnolence to coma

    Grade III patients are rousable but grossly disorientated; grade IV is coma - a hepatology emergency.

  • Minimal (covert) HE

    No obvious signs, but impaired driving, reduced quality of life, more falls and a higher risk of overt HE.

  • Red flag - deep drowsiness

    Any drop in conscious level in a patient with liver disease needs same-day hepatology review.

Treatment

How HE is treated in the UK.

Treat the precipitant, titrate lactulose, add rifaximin after an index episode - and, where needed, walk the TIPS or transplant path.

  • Treat the precipitant

    GI bleeding, infection (including spontaneous bacterial peritonitis), electrolyte upset, dehydration or sedative overuse - fixing this alone often resolves HE.

  • Lactulose

    First-line laxative - titrated to two or three soft stools a day. Acidifies the gut and reduces ammonia absorption. Oral, plus rectal retention enemas in severe cases.

  • Rifaximin (Xifaxanta)

    A non-absorbable antibiotic added after an index episode of overt HE. NICE-approved for secondary prevention alongside lactulose and specialist commissioned.

  • L-ornithine-L-aspartate

    LOLA - a specialist option in selected patients, aimed at ammonia detoxification when standard therapy is insufficient.

  • Nutritional support

    Protein is not restricted - aim for 1.2 to 1.5 g/kg/day with specialist dietetic input. Branched-chain amino acids may be considered.

  • TIPS review

    When HE follows a transjugular intrahepatic portosystemic shunt, the shunt itself may need reduction or occlusion by interventional radiology.

  • Liver transplantation

    The definitive treatment for recurrent or refractory HE in cirrhosis - assessed through the specialist transplant pathway.

  • MDT hepatology care

    A specialist commissioned team - hepatology, transplant, dietetics, pharmacy and the British Liver Trust - coordinates long-term management.

What this guide is based on

The sources behind every claim on this page.

European and North American hepatology guidance and UK national standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or hepatology team knows your liver and history and can tell you which parts apply to you. If in doubt, get seen.

  • EASL. Clinical Practice Guidelines on the management of hepatic encephalopathy.

  • AASLD. Practice Guidance on hepatic encephalopathy in chronic liver disease.

  • ISHEN. Consensus on the definition, nomenclature, diagnosis and quantification of hepatic encephalopathy.

  • NICE TA337. Rifaximin for preventing episodes of overt hepatic encephalopathy.

  • British Liver Trust. Patient information on hepatic encephalopathy and cirrhosis.

Red flags

When HE needs urgent attention.

Some HE can be managed at home with good lactulose control. These are the situations that cannot - and where hospital review is needed.

  • Grade III to IV HE

    Deep drowsiness, gross disorientation or coma - a hepatology emergency needing hospital-based care, often on HDU or ITU.

  • Suspected GI bleeding

    Melaena, haematemesis or a sudden drop in haemoglobin in a cirrhotic patient - the commonest precipitant of HE.

  • Suspected infection or SBP

    Fever, abdominal pain or a rise in inflammatory markers - see our guide to spontaneous bacterial peritonitis (SBP).

  • New jaundice or rising bilirubin

    A sign that liver function has deteriorated - warrants urgent hepatology review.

  • Sedative, benzodiazepine or opioid

    Any new prescription of central-nervous-system depressants can precipitate HE in cirrhosis - review the medication list first.

  • Acute liver failure (Type A HE)

    HE in a previously healthy liver is a transplant emergency - see our guide to fulminant liver failure.

  • TIPS-induced HE

    New or worsening HE after a transjugular intrahepatic portosystemic shunt - the shunt itself may need revision.

  • Hepatocellular carcinoma

    Progression of underlying liver disease or a new HCC can present as HE - see our guide to hepatocellular carcinoma.

  • Falls, unsafe driving or accidents

    Even minimal HE can cause dangerous impairment - discuss driving with the DVLA and family.

Living with it

A treatable complication, with a clear plan.

Four things that make the biggest difference day to day - your lactulose target, your protein intake, your triggers and your team.

A quiet reminder

Consistency beats intensity, every time.

Small, steady habits - kept up for months - do more than a heroic week that does not last.

  1. 01 Bowels

    Two to three soft stools a day

    Lactulose is titrated to hit that target - it is the single most important thing you can do every day.

  2. 02 Nutrition

    Eat enough protein

    Do not restrict protein - aim for 1.2 to 1.5 g/kg/day with small, frequent meals and a late-evening snack, guided by a specialist dietitian.

  3. 03 Triggers

    Watch for precipitants

    Infections, dehydration, constipation, new sedatives and GI bleeding all trigger episodes - flag these early to your hepatology team.

  4. 04 Support

    Use specialist commissioned services

    Hepatology MDT, transplant assessment and the British Liver Trust exist to help - do not manage recurrent HE alone.

Frequently asked

Everything we get asked about hepatic encephalopathy.

Quick answers on precipitants, lactulose, rifaximin, protein intake and the transplant path.

  • What is hepatic encephalopathy?

    A neuropsychiatric syndrome caused by liver dysfunction and portosystemic shunting. Toxic metabolites - including ammonia, inflammatory mediators and gut-derived toxins - cross the blood-brain barrier and affect brain function. It ranges from subtle cognitive impairment (minimal HE) to coma.

  • What causes an episode of HE?

    Almost every overt episode has a precipitant: GI bleeding, infection (including spontaneous bacterial peritonitis), electrolyte upset such as hypokalaemia or alkalosis, constipation, dehydration, sedative or opioid use, excess dietary protein, alcohol, TIPS, worsening liver failure or a new hepatocellular carcinoma. Finding and treating the trigger is the first step.

  • How is HE diagnosed?

    On clinical grounds. A hepatologist looks for asterixis, altered mental state, fetor hepaticus and cirrhosis signs, alongside blood tests, a septic screen, liver ultrasound and, where needed, CT brain to rule out other causes. Ammonia is often raised, but a normal level does not rule HE out and a raised level does not confirm it. Minimal HE is picked up by specialist psychometric testing such as PHES or the Stroop test.

  • What is the first-line treatment?

    Lactulose, titrated to two or three soft stools a day, alongside aggressive treatment of the precipitant. Rectal retention enemas are used when patients are too drowsy for oral therapy. After an index episode of overt HE, rifaximin is added as secondary prevention under NICE guidance.

  • Do I need to cut protein out of my diet?

    No. Modern EASL and AASLD guidance recommends 1.2 to 1.5 g/kg/day of protein - restricting protein worsens malnutrition and sarcopenia without reducing HE. A specialist dietitian will help you build a plan with small, frequent meals and a late-evening snack.

  • Will I need a liver transplant?

    Recurrent or refractory HE in cirrhosis is a strong indication to be assessed by a specialist commissioned transplant service. Transplantation is the definitive treatment. In the meantime, optimising lactulose, adding rifaximin, treating precipitants and TIPS review (if relevant) usually keep episodes under control.

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