Alcoholic hepatitis is a form of liver inflammation caused by heavy drinking, typically over many years. It ranges from mild, with symptoms you might not notice, to severe, where the 28-day mortality rate reaches 30%. Unlike simple fatty liver, which can develop after just a few days of heavy drinking and often reverses on its own, alcoholic hepatitis involves active damage and inflammation that can quickly become life-threatening.
How Heavy Drinking Damages the Liver
Your liver processes alcohol through a series of chemical steps, and each one generates toxic byproducts. The first step converts alcohol into acetaldehyde, a compound that is directly poisonous to liver cells. That gets further broken down into acetate, which is harmless. But both of these conversion steps produce what are called reactive oxygen species: unstable molecules that damage cell membranes, proteins, and DNA inside liver tissue. A second processing pathway generates even more of these destructive molecules, including several types of free radicals.
The damage doesn’t stop at the liver itself. Chronic alcohol use breaks down the tight junctions between cells lining your gut, making the intestinal wall leaky. Bacterial toxins that would normally stay in your digestive tract slip into the bloodstream and travel directly to the liver through the portal vein. Once there, they activate specialized immune cells, which respond by flooding the area with inflammatory signals. Two of the most important, TNF-alpha and IL-1-beta, drive a cycle of inflammation that compounds the direct chemical injury from alcohol processing. Blood levels of TNF-alpha correlate directly with the severity of liver damage and with mortality.
This combination of oxidative damage, toxic byproducts, and immune overactivation is what distinguishes alcoholic hepatitis from simple fatty liver. Fat accumulation alone is relatively benign. The inflammation is what kills liver cells and, if it persists, leads to scarring.
How Much Drinking Creates Risk
The threshold is lower than many people expect. For men, consuming roughly 40 to 80 grams of ethanol per day for 10 to 12 years is a general predictor for developing serious alcoholic liver disease, including alcoholic hepatitis. For women, the range is 20 to 40 grams per day over the same period. To put that in practical terms, a standard drink in the U.S. contains about 14 grams of ethanol. So for women, as few as one and a half to three drinks per day sustained over a decade can set the stage for this condition. For men, three to six drinks daily.
Not everyone who drinks at these levels develops alcoholic hepatitis. Genetics, nutritional status, obesity, smoking, and co-existing infections with hepatitis B or C all influence individual risk. But the dose-duration relationship is consistent across large studies: more alcohol over more years means higher risk.
Symptoms and Warning Signs
The hallmark of alcoholic hepatitis is jaundice, a yellowing of the skin and eyes caused by the liver’s inability to clear bilirubin from the blood. Elevated bilirubin shows up on blood tests in nearly every case, though visible yellowing appears in about 40% to 60% of hospitalized patients. Other common symptoms include pain or tenderness in the upper right side of the abdomen, fever, and a rapid heartbeat.
On examination, an enlarged liver is the most frequent physical finding, present in over 80% of hospitalized cases. Fluid buildup in the abdomen (ascites) affects roughly 35% to 57% of patients. In more severe disease, the brain starts to suffer from the liver’s failure to filter toxins, leading to confusion, disorientation, or reduced consciousness. This complication, known as hepatic encephalopathy, occurs in 18% to 45% of hospitalized patients depending on the severity of the episode. Kidney failure, abnormal bleeding from clotting problems, and dangerously low platelet counts can also develop.
How It’s Diagnosed
Diagnosis relies on a combination of drinking history, physical findings, and blood work. One of the most characteristic lab patterns is the ratio of two liver enzymes: AST and ALT. In most forms of liver disease, ALT is higher. In alcoholic hepatitis, AST is typically elevated to at least 1.5 to 2 times the level of ALT. This flipped ratio happens partly because chronic alcohol use depletes vitamin B6 in the liver (which ALT needs to function) and partly because alcohol damages the energy-producing structures inside liver cells, releasing extra AST into the bloodstream.
That said, this ratio isn’t absolute. About one-third of patients with biopsy-proven alcoholic cirrhosis have an AST-to-ALT ratio below 1.0, particularly if they also have a viral liver infection. Doctors also look at bilirubin levels, clotting times, white blood cell counts, and kidney function to build the full picture.
Gauging Severity
Once alcoholic hepatitis is suspected, doctors calculate a severity score called the Maddrey Discriminant Function, or MDF. It uses bilirubin levels and clotting time to produce a single number. A score below 32 indicates mild to moderate disease, where 30-day survival without specific treatment exceeds 90%. A score of 32 or higher defines severe alcoholic hepatitis, where 30-day mortality jumps above 20% to 30% even with treatment. That threshold also determines whether corticosteroid therapy is likely to help.
Treatment Options
For severe cases (MDF of 32 or higher), the standard treatment for more than 50 years has been a four-week course of the corticosteroid prednisolone. The goal is to suppress the inflammatory cascade that is actively destroying liver tissue. Not all patients respond, and steroids carry their own risks, including increased susceptibility to infection. Doctors reassess after about a week to determine whether the treatment is working. If liver function isn’t improving, steroids are typically stopped.
For mild to moderate cases, there is no specific drug treatment that has been shown to improve outcomes. The focus shifts entirely to stopping alcohol use and supporting the body’s recovery through nutrition.
Nutrition as Treatment
Malnutrition is extremely common in people with alcoholic hepatitis, partly because heavy drinkers tend to eat poorly and partly because the inflamed liver can’t process nutrients efficiently. Current guidelines recommend that patients with severe alcoholic hepatitis consume 35 to 40 calories per kilogram of body weight per day and 1.2 to 1.5 grams of protein per kilogram per day. For a 70-kilogram (154-pound) person, that means roughly 2,450 to 2,800 calories and 84 to 105 grams of protein daily. Meeting these targets is difficult when you feel sick, so small, frequent meals and sometimes supplemental nutrition through a feeding tube are used.
The Role of Abstinence in Survival
Stopping alcohol is the single most important factor in long-term survival. In a study of hospitalized patients with alcohol-related cirrhosis, the overall five-year survival rate was 43%. But continued drinking was one of the strongest independent predictors of death, with a highly significant statistical association. Patients who stopped drinking had markedly better outcomes at every stage of liver disease.
Alcoholic hepatitis, unlike established scarring, is potentially reversible. The inflammation can resolve if the trigger is removed. In the same study, the presence of active alcoholic hepatitis on biopsy actually carried a favorable prognostic significance compared to pure cirrhosis, precisely because it represents a reversible component of liver failure. Scarring that has already occurred won’t reverse, but the active inflammation on top of it can, and that alone can shift someone from decompensated liver failure back toward stability.
Other factors that independently worsened five-year survival included older age, more advanced liver failure (measured by the Child-Pugh score), gastrointestinal bleeding, co-infection with hepatitis B or C, and smoking. Patients in the earliest stage of cirrhosis who stopped drinking had a five-year survival rate of 66%, while those in the most advanced stage survived at only a 25% rate regardless of other factors.
How It Fits Into Alcoholic Liver Disease
Alcoholic hepatitis is one stage in a spectrum. The earliest change is fatty liver, where fat accumulates in liver cells but inflammation is minimal. This is present in up to 90% of heavy drinkers and reverses within weeks of stopping. If drinking continues, some people progress to alcoholic hepatitis, where inflammation and cell death become active. If that persists, the liver begins to scar (fibrosis), eventually leading to cirrhosis, where the architecture of the liver is permanently restructured and its function progressively declines.
These stages can overlap. A person can have fatty liver, active hepatitis, and early scarring all at the same time. Alcoholic hepatitis can also appear suddenly as an acute episode in someone who may or may not already have underlying cirrhosis. This acute-on-chronic pattern is common and is often what brings people to the hospital for the first time.