Key points
- Early signs are easy to miss: sleeping in the day and staying awake at night, irritability, slowed thinking and poor handwriting.
- Most episodes have a trigger — constipation, infection, bleeding, dehydration or sleeping tablets — and treating the trigger is half the treatment.
- Lactulose (to give two to three soft stools a day) and rifaximin are the standard medicines.
- Protein should not be cut from the diet; people with cirrhosis need more protein, not less.
- An episode of encephalopathy in cirrhosis is a signal for liver transplant assessment.
What happens in the brain
The gut produces ammonia and other substances as it digests protein, and bacteria in the bowel add more. A healthy liver removes them before they reach the brain. In cirrhosis, the scarred liver clears them poorly, and some blood also bypasses the liver through enlarged veins created by portal hypertension. These substances affect brain chemistry, causing brain swelling at a microscopic level and slowed nerve signalling.
In cirrhosis the changes are usually reversible once the trigger is corrected. In acute liver failure — a previously healthy liver failing suddenly — encephalopathy is more dangerous because the brain can swell rapidly, and it is one of the criteria for an emergency transplant.
How families recognise it
Families often notice encephalopathy before doctors do. Look for a change from the person's usual self:
- Reversed sleep pattern — drowsy through the day, restless or awake at night.
- Forgetfulness, repeating questions, trouble with simple calculations or counting money.
- Irritability, inappropriate behaviour or unusual cheerfulness.
- Slurred or slowed speech, and handwriting that becomes shaky or untidy.
- Flapping tremor (asterixis): when the arms are held out with wrists bent back, the hands give irregular, flapping jerks.
- A sweetish, musty smell to the breath (fetor hepaticus).
- Increasing sleepiness, then difficulty waking, and finally coma.
Grades of hepatic encephalopathy
| Grade | What you see | Typical care |
|---|---|---|
| Minimal / covert | Normal on the surface; only slowed reactions or attention on testing. Driving can be unsafe. | Outpatient treatment; avoid driving until reviewed |
| Grade 1 | Poor attention, disturbed sleep, mild mood change | Outpatient treatment if a clear trigger is found and managed |
| Grade 2 | Lethargy, disorientation in time, flapping tremor, inappropriate behaviour | Usually needs hospital admission |
| Grade 3 | Very drowsy but rousable, confused about place, incoherent | Hospital, often high-dependency care |
| Grade 4 | Coma, no response to voice | Intensive care; airway protection |
Common triggers to look for
Constipation
The most common and easiest to fix. Fewer than two soft stools a day on lactulose should prompt a call to the doctor.
Infection
Urinary infection, chest infection or infected ascites (spontaneous bacterial peritonitis). Fever is not always present.
Bleeding in the gut
Blood in the bowel is a large protein load. Black stools or vomiting blood with confusion is an emergency.
Dehydration and salt imbalance
Over-use of diuretics, diarrhoea from too much lactulose, vomiting, or low blood sodium or potassium.
Sedatives and some medicines
Sleeping tablets (benzodiazepines such as alprazolam), strong painkillers and some antihistamines can bring on encephalopathy. Avoid them unless prescribed by the liver team.
Alcohol and kidney injury
A relapse in drinking, or worsening kidney function, can also tip the balance.
Treatment: lactulose, rifaximin and nutrition
- 1
Find and treat the trigger
Blood tests, a urine test, a chest X-ray, a tap of any ascites, and checking for bleeding. Infections are treated with antibiotics; sedatives are stopped; fluids and salts are corrected.
- 2
Lactulose
A sweet syrup that draws ammonia into the bowel and clears it. The dose is adjusted to produce two to three soft stools a day — not watery diarrhoea, which causes dehydration and can make things worse. In hospital it can be given by tube or enema if the patient cannot swallow.
- 3
Rifaximin
An antibiotic that stays in the gut and reduces ammonia-producing bacteria. Added to lactulose, it lowers the chance of further episodes and hospital admissions after a first overt episode.
- 4
Keep eating protein
Old advice to stop protein is wrong and harmful. Muscle helps clear ammonia, and people with cirrhosis lose muscle fast. The usual target is about 1.2–1.5 g of protein per kg of body weight a day, spread through the day, with a late-evening snack (for example milk, curd, eggs or a small meal) to prevent overnight fasting. Dal, paneer, curd, eggs, fish and chicken are all suitable; vegetable and dairy protein may be better tolerated in some patients.
Driving and safety at home
Even mild encephalopathy slows reaction time. People who have had an episode should not drive until the liver team says it is safe, should not handle machinery, and should not be left in charge of their own medicines if they are confused.
When confusion is an emergency
Take the person to hospital the same day if there is:
increasing drowsiness or difficulty waking; confusion about where they are or who family members are; aggressive or very abnormal behaviour; confusion with fever, abdominal pain, vomiting blood or black stools; seizures; or any confusion in someone with recent jaundice who was previously well (possible acute liver failure). Do not give sleeping tablets to calm them.
Not every confusion in a liver patient is encephalopathy. Low blood sugar, a head injury from a fall (people with liver disease bleed more easily), stroke, alcohol withdrawal and infection of the brain can look similar, so doctors check for these too.
Why encephalopathy means transplant assessment
Overt hepatic encephalopathy is one of the complications that define decompensated cirrhosis, alongside ascites, variceal bleeding and jaundice. Once it has occurred, outlook without a transplant is limited, and repeated episodes affect work, family life and safety. Guidelines therefore recommend that patients who have had an episode of overt encephalopathy be referred for liver transplant evaluation.
Encephalopathy usually improves after a successful liver transplant, although long-standing episodes may leave some subtle effects on memory and concentration. When encephalopathy occurs as part of acute-on-chronic liver failure or acute liver failure, the decision about transplant can be needed within days, so early contact with a transplant centre matters.
Dr Bappaditya Har works with hepatologists and intensivists at Narayana RN Tagore Hospital, Kolkata to assess such patients. Reports can be shared first on WhatsApp (+91 70420 39420).
Frequently asked questions
Is hepatic encephalopathy reversible?
In cirrhosis, most episodes reverse once the trigger is treated and lactulose is working. However, it tends to come back, and each episode indicates advanced liver disease that should be assessed for transplant.
Should a person with hepatic encephalopathy stop eating protein?
No. Protein restriction worsens muscle loss and does not help. Aim for about 1.2–1.5 g per kg of body weight a day, in small meals with a bedtime snack, unless a doctor advises otherwise for a short period.
How many times a day should someone on lactulose pass stools?
Usually two to three soft stools a day. Fewer suggests the dose should be increased; watery diarrhoea many times a day means the dose is too high and risks dehydration.
What is flapping tremor?
Also called asterixis, it is an irregular flapping of the hands when the arms are stretched out with the wrists bent back. It is a classic sign of hepatic encephalopathy, though it can occur in some other conditions.
Can sleeping pills cause confusion in liver patients?
Yes. Benzodiazepines and similar sleeping tablets are a common trigger of hepatic encephalopathy. People with cirrhosis should avoid them unless prescribed by their liver doctor.
Does liver transplant cure hepatic encephalopathy?
In most patients encephalopathy resolves after a successful transplant, because the new liver clears toxins normally. A few people who had long-standing encephalopathy may notice some minor lasting effects on memory.
Related reading
Liver Cirrhosis Treatment in Kolkata: Stages, Care and When to Consider a Transplant →
Cirrhosis explained: compensated vs decompensated, Child-Pugh and MELD in plain words, what treatment can and cannot do, and when to consider a transplant.
Acute-on-Chronic Liver Failure (ACLF): Triggers, ICU Care and Transplant in Kolkata →
ACLF is a sudden, dangerous worsening of chronic liver disease. Learn the triggers, organ failures, ICU treatment and when liver transplant is considered.
Liver Transplant Evaluation: Who Needs It, MELD Scores and the Tests →
Who needs a liver transplant, what MELD and PELD scores mean, the tests in a transplant work-up, reasons transplant may not be possible, and what to bring.
Ascites: Fluid in the Abdomen — Causes, Treatment and When It Means Transplant →
Fluid in the abdomen is usually a sign of advanced cirrhosis. Learn the causes, the tap test, salt limits, diuretics, tapping and when transplant helps.
Liver Failure Treatment →
Acute and chronic liver failure, and when transplant is needed.
This page is general patient information, not a diagnosis or a substitute for a consultation. Treatment decisions depend on each patient's reports and examination. Read our medical disclaimer and editorial policy.