Hepatic Encephalopathy: When Confusion Isn't Drinking

Your mother is repeating the same sentence. She called you at two in the afternoon and asked why it was dark. Her handwriting on the grocery list has gone small and shaky, and last night she was awake at four, sorting mail. The family has seen this before, and everyone has already decided what it means: she is drinking again.

Sometimes that is exactly what is happening. But if she also has cirrhosis or any other advanced liver disease, there is a second explanation that families routinely miss and emergency departments routinely under-diagnose — and it is treatable within hours. It is called hepatic encephalopathy, and the confusion it causes is not a character flaw, a relapse, or a stage of dying. It is ammonia.

What Hepatic Encephalopathy Actually Is

The liver's job includes neutralising toxins that the gut produces. When the liver is scarred or blood is shunted around it, ammonia — a by-product of digesting protein and of normal gut bacteria — stops being cleared properly. It crosses into the brain, gets converted to glutamine, and pulls water into brain cells. The result is swollen, inflamed brain tissue that produces exactly the symptoms families describe as "drunk" or "not herself."

The scale is not rare. Chronic liver disease affects roughly 2.6% of the U.S. population, and hepatic encephalopathy affects approximately 202,000 U.S. adults, with projections of about 697,000 by 2030 as the population with cirrhosis grows. Overt hepatic encephalopathy develops in 30% to 40% of people with cirrhosis at some point in their illness. A milder form that only shows up on neuropsychological testing — "covert" or "minimal" hepatic encephalopathy — has been reported in anywhere from 20% to 80% of patients with cirrhosis, depending on how it is measured.

Clinicians sort it three ways: by cause (acute liver failure, portosystemic shunting without significant liver disease, or cirrhosis), by grade, and by course. A single episode is "episodic." Two or more episodes within six months is "recurrent." When a person never fully returns to their previous level of thinking, it is called "persistent."

The Grades: What You Will Actually See

The West Haven criteria are the working language clinicians use, and they are useful at home because they describe behaviour rather than lab values.

• Minimal — no visible change. Only testing finds it.
• Grade 1 — flipped sleep rhythm, euphoria or anxiety, trouble doing simple arithmetic in their head, short attention span, a kind of blunted awareness of small things.
• Grade 2 — asterixis, disorientation to time, clumsiness (dyspraxia), inappropriate behaviour, lethargy or apathy, an obvious personality change.
• Grade 3 — bizarre behaviour, confusion, gross disorientation, sleepy but rousable, drifting toward stupor.
• Grade 4 — coma.

Grades 1 and below count as "covert." Grade 2 and above is "overt," and it is the line where the person is generally no longer safe to manage alone at home.

How to Check for Asterixis at Home

Ask the person to hold both arms out in front of them, wrists bent backward, fingers spread, for about thirty seconds. Watch the hands. Asterixis is a rapid, non-rhythmic flap — the wrist briefly drops and corrects — and it is not the same as the fine shaking of anxiety or withdrawal. One hand may flap and the other not. If you see it, say so out loud when you call the clinic or the emergency department, because it is one of the specific findings clinicians look for.

Why Families and Sometimes Emergency Departments Miss It

Hepatic encephalopathy has a long list of convincing look-alikes. Standard reference material lists alcohol intoxication, alcohol withdrawal, bleeding inside the skull such as a subdural hematoma, and Wernicke-Korsakoff syndrome among the conditions that can appear nearly identical. Emergency physicians add medication side effects, electrolyte problems including low blood sugar and low sodium, kidney failure, sepsis, central nervous system infection, non-convulsive seizures, psychiatric illness, high carbon dioxide, and stroke.

Two things follow from that list, and both matter for you:

First, the diagnosis usually depends on a witness. A confused person cannot give a reliable history. In the emergency department, the recommended approach is explicitly to obtain collateral information from family, caregivers, EMS, or nursing home staff — so your information is not a courtesy, it is part of the diagnostic test. Come with the medication list, the date of the last bowel movement, the last drink, any recent procedures (a TIPS shunt is a known trigger), and a plain sentence about what is different from normal.

Second, being disbelieved is common enough that it is written into the literature. Reviews of hepatic encephalopathy describe stigma as an active burden on patients and caregivers. Families get treated as unreliable narrators because the patient smells of alcohol or has a known history, and the ammonia goes untreated for another day. If you are brushed off, say the words: "He has cirrhosis. I am his daughter. This is not his baseline. Please check for hepatic encephalopathy."

What Triggers an Episode — and What You Can Fix Tonight

The single most useful fact in this entire guide is this: nearly 90% of patients improve when the precipitating factor is found and corrected. An episode is usually not a random deterioration. Something set it off, and the list is short.

• Constipation. This is the one families can fix. Stool sitting in the colon keeps producing ammonia.
• Dehydration, from poor intake, vomiting, diarrhoea, or over-diuresing.
• Infection. Up to 10% of people with overt hepatic encephalopathy also have spontaneous bacterial peritonitis, an infection of abdominal fluid that can be silent. Urinary tract infections and pneumonia are common triggers too.
• Gastrointestinal bleeding, including bleeding that only shows up as black stools.
• Electrolyte problems — low potassium, low sodium — often caused by diuretics or by diarrhoea.
• Acute kidney injury, which is both a trigger and, in our guide to kidney injury after an overdose, a complication worth knowing about.
• Sedating medications: benzodiazepines, opioid painkillers, sleeping pills, and other drugs the liver breaks down. Alcohol itself, including a binge after a period of abstinence.
• Uncontrolled diabetes, recent surgery, a new or clotted shunt, and muscle wasting.

For families, three habits cover most of it. Keep a bowel-movement log — on lactulose the target is generally two to three soft stools a day, and both zero and ten are wrong. Never let a constipation day slide into a third. And treat every new prescription, including over-the-counter sleep aids and antihistamines, as something to run past the liver team first.

Ammonia: The Blood Test Families Ask About Most

Everyone asks about the ammonia level, and the honest answer is uncomfortable: it is a poor test for this disease.

Up to 40% of patients with hepatic encephalopathy have a normal ammonia level. High levels alone add little diagnostic, staging, or prognostic value in people with chronic liver disease, and repeated ammonia measurements are neither predictive nor cost-effective. So a "normal ammonia" does not mean your mother is fine, and an elevated one does not prove the confusion is hepatic. The diagnosis is clinical: the right symptoms, in a person with the right liver disease, after other causes have been excluded. Ammonia can support the story. It cannot settle it.

Medicines That Prevent the Next Episode

Two drugs do most of the work, and the evidence for both is strong.

Lactulose is a non-absorbable sugar that acidifies the colon and reduces ammonia production by gut bacteria. It is first-line treatment and the standard secondary prevention after a first episode. A 2026 meta-analysis of 17 randomised trials and 1,428 patients found lactulose cut the incidence of overt hepatic encephalopathy by more than half — a pooled relative risk of 0.48 — with a similar effect when used purely as prevention (relative risk 0.43), no increase in adverse events, and a high probability of reducing mortality. In hospital, the acute regimen is aggressive: 30 to 45 mL every one to two hours until mental status improves, or rectally if the person cannot swallow safely. At home you follow the prescribed maintenance dose and titrate to those two or three soft stools.

Rifaximin is a gut-targeted antibiotic added to lactulose when a second episode occurs. At 550 mg twice daily it reduced breakthrough episodes by 58% and hepatic-encephalopathy-related hospitalisation by 50% in the pivotal trial. It is expensive, and cost is a real barrier — which is why the hospital's case management team, not the family, should be asked to check the insurance benefit and patient assistance options before discharge.

Here is the part that should worry you more than the pharmacology. In a U.S. study of 2,810 patients with cirrhosis, 28.1% were discharged without any hepatic encephalopathy prophylaxis at all. Only about 35% of patients on lactulose as secondary prevention were adherent. Among patients started on rifaximin, the estimated probability of stopping it was 38% by 90 days, 59% by 180 days, and 65% by one year. Non-adherence raised the odds of recurrence 3.3-fold, and in one cohort every patient who stopped lactulose had another episode.

The reasons people quit are mundane and fixable: diarrhoea (about 23%), the taste (13%), and bloating (10%). If your relative is skipping doses, that is not defiance, it is a side-effect problem with a solution — smaller divided doses, timing, chilled liquid, a different laxative strategy under supervision. Say it to the hepatology clinic in exactly those words.

What to Ask Before They Leave the Hospital

Discharge is where these episodes are won or lost, and the questions are the same in every hospital. Write them on your phone before you go in.

• What is the discharge lactulose dose, and what is the bowel-movement target? You want a number you can count, and a written instruction for what to do if it overshoots into watery diarrhoea.
• Is rifaximin being started, and has someone checked the coverage? Ask for case management by name. High out-of-pocket cost is documented as a reason people stop the drug, and patient assistance programs exist.
• What was the precipitant? Infection, bleeding, constipation, a new sedative — ask which one was found. If nobody can name it, ask again.
• Who do we call after hours, and at what point do we go back to the emergency department?
• What does "worse" look like for this person? Ask the team to describe the first two or three signs of recurrence for this specific patient, because early signs look different from the way it presented the first time.
• Is a hepatology or transplant follow-up booked, and when?

Guidelines treat appropriate prophylaxis at discharge as a quality measure, yet more than one in four patients leaves without it. Asking is not being difficult. It is the difference between a treatable episode and a readmission.

Food: The Old Advice Was Wrong

You will still find handouts, and even some older clinicians, telling liver patients to cut back on protein. Current guidance says the opposite. For cirrhosis, the recommended intake is roughly 35 to 40 kcal per kilogram of ideal body weight per day and 1.2 to 1.5 grams of protein per kilogram per day — and protein should not be restricted, including in patients with hepatic encephalopathy.

The reason is muscle. Skeletal muscle is an alternative site of ammonia disposal, and sarcopenia is itself a recognised trigger for episodes. Restricting protein shrinks the muscle that was helping clear the ammonia. Vegetarian protein sources are worth discussing with a dietitian. Zinc supplementation is conditionally recommended in the 2025 American College of Gastroenterology nutrition guidance for patients with low zinc, and branched-chain amino acids are recommended when available.

The randomised evidence for feeding people properly is some of the most striking in this field: in a trial of 150 patients with cirrhosis and recent hepatic encephalopathy, nutrition therapy on top of stable lactulose cut further episodes from 48.0% to 13.3% and related hospitalisations from 32.0% to 10.7%. Food is treatment, not an afterthought. Our nutrition and wellness guide covers the recovery-side basics.

Driving, Falls, and Decisions Nobody Wants to Make

Hepatic encephalopathy impairs attention, visuospatial ability, reaction time, and executive function — the exact skills driving requires — and is associated with higher rates of motor vehicle collisions. Even the covert form is linked to increased falls, hospitalisation, and progression to overt episodes.

There is no single test that settles whether someone can drive, and guidance differs between countries. What hepatologists describe as a workable approach after an overt episode is a time-limited restriction on driving, followed by a conditional return once the person has been clinically stable and adherent to treatment. In practice, someone in your family has to hold that line. Taking the keys during an episode is not punishment and it is not a verdict on the rest of their life; it is the same as holding the keys after a seizure.

The wider costs land on the household. Among patients with a history of hepatic encephalopathy, 13% were employed compared with 81% of those without, and 71% had reduced their work schedule compared with 39%. Caregivers carry measurable psychiatric load: 28% reported mild to severe depression and 39% reported anxiety, with burden scores significantly higher in caregivers of patients with a history of hepatic encephalopathy. If you are the one doing the medication runs and the night checks, that is not a side issue. It is the thing most likely to break first.

If Your Loved One Is Still Drinking

Alcohol-related liver disease is the context in which most families meet hepatic encephalopathy, and continued drinking keeps feeding it. Reviews of recurrence prevention put alcohol cessation alongside precipitating-factor control as a core element of improving prognosis, not as a moral add-on.

Two reframes help. The first: an episode of confusion is not proof of a relapse, and a relapse is not proof that treatment is pointless. Both can be true on the same day, and both are manageable. The second: treating the alcohol use disorder is part of treating the liver. Our guides on alcohol addiction treatment and medication-assisted treatment cover the options, and supporting a loved one through detox covers the part where withdrawal itself can be dangerous in someone with liver disease.

There is a hopeful data point buried in the adherence literature: a single structured fifteen-minute education session with patients and caregivers was associated with an 86% lower hazard of hepatic-encephalopathy-related hospitalisation over the following year in a small randomised trial. Understanding the disease is not a consolation prize. It is an intervention.

When to Call 911 or Go In

New confusion in a person with known liver disease is a medical emergency, not a wait-and-see situation. Go now, or call 911, if any of the following is true:

• The person cannot be roused, or is sleepy but not fully waking.
• Speech is incomprehensible, or behaviour is bizarre or aggressive in a way that is new.
• Fever, abdominal pain, or vomiting blood, or black tarry stools.
• A fall with a head strike, especially on a blood thinner.
• A seizure.
• No urine output, or vomiting to the point of not keeping fluids down.
• They are too confused to take oral lactulose.

Do not let anyone "sleep it off," and do not wait for morning. At triage, say "liver disease" and "hepatic encephalopathy," hand over the medication list, and mention the last bowel movement, the last drink, and any recent infection. Families who name the diagnosis get faster workups.

Where to Get Help

• SAMHSA National Helpline — 1-800-662-4357, free, confidential, 24/7, English and Spanish.
• 988 Suicide and Crisis Lifeline — call or text 988.
• FindTreatment.gov — for licensed treatment options by location and payment type.
• Your hepatology or gastroenterology clinic — ask specifically who to call after hours, and get the number in writing before you need it.
• A liver transplant centre, if episodes are recurrent despite treatment; guidelines strongly recommend evaluation in that situation.

Bottom Line

Hepatic encephalopathy is ammonia reaching the brain through a liver that can no longer clear it. It is common, it is graded, it is frequently mistaken for drinking, and most episodes improve once the trigger is found and treated. The work of a family is unglamorous and specific: watch the bowels, keep the medication going, protect the person from driving and falls during an episode, feed them protein rather than withholding it, and treat new confusion as an emergency every single time.

If you take one sentence from this guide, take this one: the confusion is not a verdict on your loved one's character. It is a number that can be brought down.