[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [General pathology](https://durgical.com/en/general-pathology/) › [Liver and gallbladder](https://durgical.com/en/general-pathology/areas/liver/) › Liver failure: acute, chronic and acute-on-chronic

# Liver failure: acute, chronic and acute-on-chronic

- Topic

When most of the liver stops working, toxins build up, blood stops clotting, the brain clouds and the kidneys may fail.

Updated Nov 12, 2026

## Key points

- Acute liver failure: encephalopathy and coagulopathy (INR rise) within weeks of onset, without prior liver disease.
- Commonest causes of acute liver failure: acetaminophen and other drugs, hepatitis A, B and E, autoimmune hepatitis; also Wilson disease and ischemia.
- Hepatic encephalopathy: ammonia and other neurotoxins escape clearance; asterixis is the classic sign.
- Hepatorenal syndrome: functional kidney failure from splanchnic vasodilation and renal vasoconstriction; the kidneys are histologically normal.
- Hyperestrogenemia: palmar erythema, spider angiomas, gynecomastia and testicular atrophy in men.
- Hepatopulmonary syndrome (intrapulmonary dilation, hypoxemia) and portopulmonary hypertension are lung complications.

## What it is

Liver failure is the loss of most hepatic function. It can be acute (in a person without prior liver disease, with encephalopathy and coagulopathy within weeks), chronic (the end of cirrhosis), or acute-on-chronic (a sudden insult on top of cirrhosis, with multiorgan failure). The clinical picture comes from the functions the liver no longer performs: clearing bilirubin, ammonia and hormones, and making albumin and clotting factors.

## Step by step

- Massive hepatocyte loss (acute) or scar replacing most parenchyma (chronic) removes functional mass.
- Bilirubin, ammonia and estrogens are no longer cleared: jaundice, encephalopathy, signs of hyperestrogenemia.
- Synthesis falls: low albumin (edema, ascites) and low clotting factors (bleeding, raised INR).
- Splanchnic vasodilation lowers effective blood volume; the kidneys vasoconstrict: hepatorenal syndrome.
- Gut bacteria and endotoxins pass the failing liver: infections and spontaneous bacterial peritonitis.
- A trigger on cirrhosis (infection, alcohol, bleeding) can tip it into acute-on-chronic liver failure with multiorgan failure.

## The three forms of liver failure

| Form | Setting | Typical causes | Liver at pathology |
| --- | --- | --- | --- |
| [Acute liver failure](https://durgical.com/en/conditions/acute-liver-failure/) | No prior liver disease; encephalopathy within weeks | Acetaminophen, idiosyncratic drugs, viral hepatitis A, B, E, autoimmune hepatitis, ischemia, Wilson disease | Massive or submassive necrosis (or microvesicular steatosis) |
| [Chronic liver failure](https://durgical.com/en/conditions/cirrhosis/) | End stage of chronic disease | Viral hepatitis, alcohol, MASLD, biliary and metabolic disease | Cirrhosis |
| Acute-on-chronic liver failure | Sudden decompensation of known cirrhosis | Infection, alcoholic hepatitis, bleeding, flare of hepatitis B | Cirrhosis plus new injury |

## Clinical notes

- Jaundice, ascites, edema, bruising, confusion, fetor hepaticus.
- Liver transplantation is the definitive treatment of irreversible failure.

## In the lab

- Prothrombin time/INR and bilirubin rise; albumin falls; ammonia may rise.
- Very high aminotransferases suggest acute necrosis (toxic, viral, ischemic); they may be near normal in end-stage cirrhosis.

## Memory aid

A failing liver forgets to clean (bilirubin, ammonia, estrogen) and forgets to build (albumin, clotting factors).

## Test yourself

Think of the answer, then tap the question to see it.

## What two features define acute liver failure?

Hepatic encephalopathy and coagulopathy developing within weeks of onset in a person with no previous liver disease.

## Why do kidneys fail in hepatorenal syndrome if they look normal?

Splanchnic vasodilation lowers effective blood volume and the renal arteries constrict intensely; the failure is functional, not structural.

## Why do men with cirrhosis develop gynecomastia and spider angiomas?

The failing liver clears estrogens poorly, so estrogen levels rise relative to androgens.

## What is the most common cause of acute liver failure in many high-income countries?

Acetaminophen toxicity, a dose-dependent hepatotoxin.

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## Elsewhere in DurgiPedia

- [Functions of the liver](https://durgical.com/en/physiology/functions-of-the-liver/)
- [Liver function tests: reading the pattern](https://durgical.com/en/biochemistry/topics/liver-function-tests-reading-the-pattern/)
- [Ammonia (ammonium)](https://durgical.com/en/biochemistry/molecules/ammonia/)
- [Urea cycle](https://durgical.com/en/biochemistry/pathways/urea-cycle/)
- [Serum albumin as a lab test](https://durgical.com/en/biochemistry/topics/serum-albumin-as-a-lab-test/)

## Connections

## Related 5

- [Cirrhosis: morphology](https://durgical.com/en/general-pathology/cirrhosis-morphology/)
- [Portal hypertension](https://durgical.com/en/general-pathology/portal-hypertension/)
- [Drug- and toxin-induced liver injury](https://durgical.com/en/general-pathology/drug-and-toxin-induced-liver-injury/)
- [Patterns of hepatocyte injury](https://durgical.com/en/general-pathology/patterns-of-hepatocyte-injury/)
- [Shock: types, stages and the organs it damages](https://durgical.com/en/general-pathology/shock-types-stages-and-the-organs-it-damages/)

## Related conditions 8

- [Acute liver failure](https://durgical.com/en/conditions/acute-liver-failure/)
- [Cirrhosis](https://durgical.com/en/conditions/cirrhosis/)
- [Hepatic encephalopathy](https://durgical.com/en/conditions/hepatic-encephalopathy/)
- [Hepatorenal syndrome](https://durgical.com/en/conditions/hepatorenal-syndrome/)
- [Acetaminophen toxicity](https://durgical.com/en/conditions/acetaminophen-toxicity/)
- [Ascites and spontaneous bacterial peritonitis](https://durgical.com/en/conditions/ascites-and-spontaneous-bacterial-peritonitis/)
- [Wilson disease](https://durgical.com/en/conditions/wilson-disease/)
- [Mushroom poisoning (Amanita)](https://durgical.com/en/conditions/mushroom-poisoning/)

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Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [Loss of brain function - liver disease: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/000302.htm) (MedlinePlus, US National Library of Medicine, 2026); [Hepatorenal syndrome: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/000489.htm) (MedlinePlus, US National Library of Medicine, 2026).

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Source: https://durgical.com/en/general-pathology/liver-failure-acute-chronic-and-acute-on-chronic/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/general-pathology/liver-failure-acute-chronic-and-acute-on-chronic/