Minimal HE (Grade 0)
There are no obvious symptoms, no disorientation, and no asterixis. Problems with attention, processing speed, and planning show up only on specialized tests. Minimal HE is part of covert HE.
AI Summary Overt hepatic encephalopathy is found in about 10% to 14% of people when cirrhosis is diagnosed, and it occurs at some point in an estimated 30% to 40% of people with cirrhosis.
Hepatic EncephalopathyBrain changes caused by advanced liver disease
Medically reviewed.
Hepatic encephalopathy (HE), also called portosystemic encephalopathy (PSE), is a decline in brain function. It happens when a damaged liver can no longer clear toxins, mainly ammonia, from the blood. The toxins build up and reach the brain.
HE ranges from subtle changes in attention that are easy to miss to severe confusion or coma. It is treatable, and many episodes are reversible, especially when you and the people around you recognize them early. This page explains the grades, symptoms, triggers, tests, treatment, and daily steps that help you stay safe.
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Severity
Grades of Hepatic Encephalopathy
Doctors describe HE on a continuum using the West Haven grades. Minimal HE and Grade I together are called covert HE. Overt HE begins when disorientation or asterixis appears.
Grade I
Thinking, mood, or sleep change in mild ways. You may feel irritable, have trouble concentrating, or notice your sleep flipping between night and day. Family members often spot these changes first. Grade I is also part of covert HE.
Grade II
This is overt HE. Asterixis, a flapping movement of the hands, is a hallmark of this grade. Confusion, slurred speech, and lethargy can also appear.
Grade III
Confusion is severe, with gross disorientation and extreme drowsiness. This needs urgent medical care, often in an intensive care unit.
Grade IV
This is coma. The person cannot be woken and does not respond. Grade IV is a medical emergency. Grades III and IV together are sometimes called brain failure.
Why the Grade Matters
Covert HE can look mild, but it often leads to overt HE. Grades III and IV are emergencies. Treatment works best when HE is found early.
Symptoms
Symptoms of Hepatic Encephalopathy
HE can develop slowly. Early changes are often subtle, so a family member or caregiver may notice them before you do.
Early or Mild Symptoms
- Irritability or mood changes
- Memory loss or trouble concentrating
- Confusion or brain fog
- Sleep that flips between night and day
Symptoms as HE Progresses
- Apathy and fatigue
- Problems with movement and coordination
- Muscle twitches
- Slurred speech and slowed responses
- Asterixis, a flapping movement of the hands
- Out-of-character or inappropriate behavior
Severe Symptoms (Get Emergency Care)
- Severe confusion or lost sense of time and place
- Extreme drowsiness or trouble waking
- Not responding at all, or coma
What Causes Hepatic Encephalopathy
The liver filters toxins from the blood. When it is damaged and cannot keep up, toxins such as ammonia build up and travel to the brain. This disrupts how the brain works and causes the mental and physical changes of HE. HE is most common in people with chronic liver disease, especially cirrhosis, but it can also happen with sudden liver damage. In some people, blood bypasses the liver through abnormal connections called portosystemic shunts. Toxins then reach the brain without being filtered. Large shunts can drive HE that keeps coming back, even when the liver still works fairly well. Some procedures that create a shunt on purpose to lower pressure in the liver's blood vessels also carry a risk of HE.
Triggers
What Can Set Off an Episode
Most HE episodes are set off by a specific event. Finding and treating that trigger is a cornerstone of care, and it often ends the episode.
Common Triggers of an Episode
- Bacterial infections, including spontaneous bacterial peritonitis
- Bleeding in the digestive tract, even if you cannot see it
- Constipation
- Dehydration
- New sedatives or water pills (diuretics)
- Fever or any illness
Things That Can Cloud Your Thinking Further
- Alcohol
- Sedating pills
- Skipping sleep
- Missing your prescribed HE medicine
Act Early on Triggers
Bacterial infections are present in more than half of people when HE first appears. If you are sick, have a fever, see bleeding, or start a new medicine, check in with your liver team quickly.
How Hepatic Encephalopathy Is Diagnosed
No single test diagnoses HE. For overt HE, the diagnosis is mainly clinical. Your doctor looks at your medical history, your mental state, and your movement, and checks for asterixis. Doctors also look for other causes of confusion, such as bleeding in the brain or stroke, and may use blood tests, liver function tests, and CT or MRI scans for this. Blood ammonia can be measured, but a high level alone does not confirm or stage HE. Covert HE causes no obvious signs, so it cannot be found on a routine exam. It needs specialized thinking tests, such as the Psychometric Hepatic Encephalopathy Score (PHES), or a brain-wave test called an EEG. Finding covert HE early matters because it predicts overt HE, more hospital stays, and lower survival. Your care team will also search for the trigger behind an episode, such as an infection or bleeding.
Learn how HE is evaluatedTreatment
Treatment Overview
Treatment has two goals: clear an active episode and prevent the next one. Treating the trigger matters as much as the medicine.
Treating the Trigger
Most HE episodes start with a specific event, such as an infection, digestive tract bleeding, constipation, or a new sedative or water pill. Treating that cause often leads to the end of the episode.
Lactulose: The First-Choice Medicine
Lactulose is the first-choice medicine for an episode of overt HE and is also used long term to prevent new episodes. It lowers the amount of ammonia absorbed into the blood and helps remove ammonia through bowel movements. Your care team adjusts the dose to produce two to three soft bowel movements a day. Take it exactly as prescribed, and call your team if confusion worsens or bowel movements become excessive.
Rifaximin: Added to Prevent Repeat Episodes
Rifaximin (Xifaxan) is an antibiotic that reduces ammonia-producing bacteria in the gut. It is added to lactulose for people whose HE comes back. The combination lowers the risk of further episodes and related hospital stays compared with lactulose alone. Many people stay on it long term.
Hospital Care for Severe HE
Severe HE (Grade III or IV) usually needs care in an intensive care unit. The team protects the airway, treats the trigger, and starts HE treatment. Sedating medicines are avoided or kept to a minimum when possible.
Shunts and Transplant for Hard-to-Treat HE
A large portosystemic shunt can drive HE that keeps coming back. In selected people, doctors may consider closing the shunt by embolization. Liver transplant is considered when HE is recurrent or persists despite medical treatment, because it carries a poor outlook on its own.
Key Point
Lactulose is the first-choice medicine, rifaximin is added when HE comes back, and treating the trigger is central to recovery.
Managing Hepatic Encephalopathy Day to Day
Catch Changes Early
- Write a short note each morning about your sleep, clarity, and mood. Rate the day as sharp, okay, fuzzy, or very confused.
- Treat a slide toward "fuzzy" as an early warning and tell your caregiver and your liver team.
- Stay hydrated, but not too much. Choose plain fluids over alcohol or sugary drinks.
- Keep regular sleep and wake times.
Head Off Triggers
- Avoid alcohol and sedating pills unless your liver team prescribes them.
- Take lactulose and rifaximin exactly as prescribed, and do not skip doses.
- Call your team quickly if you have a fever, feel sick, see bleeding, or start a new medicine.
- Keep a list of your medicines to share at every visit.
Stay Safe During an Episode
- Stay where someone can see you.
- Do not drive or handle sharp tools while you feel foggy.
- Keep your phone and emergency contacts within reach.
- Put a whiteboard with the date, pictures of loved ones, or a familiar object where you can see it.
When to Get Help
- Call your liver team the same day for new confusion, memory lapses, irritability, a flipped sleep pattern, or a hand tremor.
- Go to the emergency room for marked confusion, extreme drowsiness, or no response.
- Delay big decisions and heavy conversations until you feel clearer.
Small Habits, Early Action
Share your daily notes with your liver specialist. A clear record helps your care team adjust treatment before an episode becomes severe.
Eating With Hepatic Encephalopathy
Food and daily routine both affect HE. Protein restriction was once common advice, but it is now known to be harmful. Malnutrition and muscle loss are themselves risk factors for HE, so most people with HE need enough protein and calories. Current guidance is about 35 to 40 kilocalories per kilogram of ideal body weight and 1.2 to 1.5 grams of protein per kilogram each day. Small, frequent meals and a late-evening snack help prevent the body from breaking down muscle during a long overnight fast. Keep meals consistent and avoid wide swings in what you eat. Your care team or a dietitian will set targets that fit your weight, liver disease stage, and other conditions.
Feed Your Body, Protect Your Brain
Malnutrition and muscle loss raise the risk of HE, so do not skip meals or cut back on protein. Eat small, regular meals through the day and have a light, low-sugar, low-sodium snack in the late evening. That keeps your body from running on empty overnight. Amsety Bars are one easy snack option.
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Common Questions
Frequently Asked Questions
What is hepatic encephalopathy?
Hepatic encephalopathy is a decline in brain function caused by advanced liver disease. A healthy liver filters toxins, mainly ammonia, out of the blood. When the liver is badly damaged, or when blood bypasses it through a portosystemic shunt, those toxins build up and reach the brain. The result can be brain fog, memory loss, irritability, sleep changes, muscle twitches, and in severe cases coma. It is most common in people with cirrhosis. Overt HE is present in about 10% to 14% of people when cirrhosis is diagnosed, and 30% to 40% have an episode at some point. HE is treatable, and many episodes can be reversed.
Is hepatic encephalopathy reversible?
Yes, HE is often reversible, especially when it is found early. Episodes usually improve once the trigger is treated, such as an infection, bleeding, or constipation, and once treatment lowers ammonia in the blood. Lactulose is the first-choice medicine, and rifaximin is added when episodes come back. Recovery can be harder when HE is severe, keeps returning, or comes with very advanced liver disease. That is why prevention matters: taking your medicines every day, treating triggers fast, and keeping regular visits with your liver team. If HE keeps returning despite treatment, your team may discuss a liver transplant evaluation.
How is hepatic encephalopathy graded?
Doctors use the West Haven grades. Minimal HE has no obvious symptoms and shows up only on specialized tests. Grade I brings mild changes in attention, mood, or sleep. Together, minimal HE and Grade I are called covert HE. Grade II is the start of overt HE, with lethargy, confusion, slurred speech, and asterixis, a flapping movement of the hands. Grade III means severe confusion and extreme drowsiness. Grade IV is coma. Grades III and IV are medical emergencies and usually need care in an intensive care unit.
What triggers a hepatic encephalopathy episode?
Most episodes are set off by a specific event. Common triggers are bacterial infections, bleeding in the digestive tract, constipation, dehydration, and new sedatives or water pills (diuretics). Alcohol, sedating pills, and skipped sleep can cloud thinking further. Missing doses of your HE medicine can also bring on an episode. Infection is especially important, because bacterial infections are found in more than half of people when HE first appears. Call your liver team quickly if you have a fever, feel ill, see bleeding, or start a new medicine. Finding and treating the trigger is a cornerstone of care.
How do doctors diagnose hepatic encephalopathy?
No single test diagnoses HE. For overt HE, the diagnosis is mainly clinical. Your doctor reviews your history, checks your mental state and movement, and looks for asterixis. Blood tests, liver function tests, and CT or MRI scans help rule out other causes of confusion and look for triggers. A blood ammonia level can be measured, but a high result alone does not confirm or stage HE. Covert HE has no obvious signs, so it needs special thinking tests, such as the Psychometric Hepatic Encephalopathy Score (PHES), or a brain-wave test called an EEG. Finding covert HE early matters because it predicts overt HE.
Should I limit protein if I have hepatic encephalopathy?
No. Protein restriction was once common advice, but it is now known to be harmful. Malnutrition and muscle loss are themselves risk factors for HE. Current guidance is about 1.2 to 1.5 grams of protein per kilogram of body weight each day, along with about 35 to 40 kilocalories per kilogram of ideal body weight. Small, frequent meals and a late-evening snack help prevent muscle breakdown during the overnight fast. Avoid alcohol and stay hydrated. Your care team or a dietitian can set exact targets for your weight and liver disease stage.
When is hepatic encephalopathy an emergency?
Call your liver team the same day for new confusion, memory lapses, irritability, a flipped sleep pattern, or a hand tremor. Go to the emergency room right away for marked confusion, extreme drowsiness, trouble waking, or no response. These can signal severe HE (Grade III or IV), which can lead to coma without prompt treatment. While you wait for help, stay where someone can see you. Do not drive or use sharp tools, and keep your phone within reach. Do not wait to see if the confusion goes away on its own.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.