Most people with alcohol use disorder die from liver disease, but it’s far from the only killer. Cardiovascular failure, cancer, infections, accidents, and suicide all claim lives at dramatically higher rates than in the general population. A large Scandinavian study found that people hospitalized with alcohol use disorder died 24 to 28 years earlier than average, with men living only to about 47 to 53 and women to about 50 to 58. Globally, alcohol is responsible for 2.6 million deaths per year, roughly 4.7% of all deaths worldwide.
Liver Disease Is the Leading Cause
The liver processes nearly all the alcohol you drink, and years of heavy use cause progressive damage that moves through distinct stages. First comes fatty liver, which is reversible. Then inflammation (alcoholic hepatitis), which can become severe enough to kill on its own. Finally, cirrhosis: permanent scarring that replaces functional liver tissue until the organ can no longer do its job. The World Health Organization estimates that 50% of all cirrhosis deaths worldwide are attributable to alcohol.
Cirrhosis progresses from a compensated phase, where the remaining healthy tissue picks up the slack, to a decompensated phase, where scar tissue has overtaken the organ. Decompensated cirrhosis brings two life-threatening complications: portal hypertension (dangerously high blood pressure in the veins feeding the liver) and outright liver failure. When the liver fails, toxins accumulate in the blood, fluid fills the abdomen, and the brain can become dangerously impaired.
One of the most immediately fatal complications is variceal bleeding. Portal hypertension forces blood into fragile veins in the esophagus and stomach, which balloon and can rupture without warning. Variceal rupture is the most common fatal complication of cirrhosis. A single bleeding episode carries a 10% to 20% mortality rate within six weeks. Among those who survive, 70% will bleed again, and at least 30% of those rebleeding episodes are fatal. Among people who survive two weeks after a variceal bleed, only half are alive a year later. For patients with the most advanced liver damage, in-hospital mortality from a single bleed reaches 32%.
Liver transplantation remains the only life-saving option for end-stage alcoholic liver disease, but the number of available organs is limited, and continued drinking disqualifies most candidates.
Heart Failure and Sudden Cardiac Death
Chronic heavy drinking directly damages the heart muscle, a condition called alcoholic cardiomyopathy. The heart enlarges, weakens, and gradually loses its ability to pump blood effectively. Between 23% and 40% of all cardiomyopathy cases are attributable to alcohol, and one study of patients with enlarged, weakened hearts found that a third had alcohol as the primary cause.
Beyond the slow decline of heart failure, alcohol dramatically raises the risk of dangerous heart rhythm disturbances. Atrial fibrillation, an irregular and often rapid heartbeat, is considered one of the most serious cardiac consequences of heavy drinking and binge drinking in particular. Retrospective studies of adults aged 40 to 60 have linked binge drinking to a heightened risk of sudden cardiac death, where the heart simply stops without warning.
Cancer Risk Across Multiple Organs
Alcohol is a confirmed carcinogen. Heavy drinking increases the risk of cancers of the mouth, throat, esophagus, liver, stomach, pancreas, colon, and breast. The relationship between alcohol and cancer death follows a pattern where heavy drinkers face substantially higher cancer mortality than moderate drinkers. Globally, roughly 741,300 new cancer cases in a single year were attributable to alcohol consumption, representing about 4.1% of all cancers worldwide.
Liver cancer deserves special mention because it often develops on top of existing cirrhosis, creating a compounding threat. A person with alcohol-related cirrhosis faces both the risk of liver failure and the risk of a tumor growing in already-damaged tissue. Pancreatic cancer, another alcohol-linked malignancy, is notoriously aggressive and often diagnosed too late for effective treatment.
Infections That Turn Deadly
Alcohol suppresses the immune system in ways that make ordinary infections far more dangerous. Pneumonia is a prime example. Studies show that heavy drinkers face two to three times the mortality rate from pneumonia compared to non-drinkers. In one large Canadian cohort, male drinkers seeking addiction treatment had a sevenfold increase in pneumonia death rates compared to non-drinkers. The bacterial bloodstream infection that can accompany pneumonia occurs ten times more often in people with alcohol use disorder, and alcoholics are four times more likely to die from it. When that infection progresses to full sepsis with a critically low white blood cell count, mortality exceeds 80%.
Tuberculosis is another significant threat. Alcohol abuse nearly triples the risk of developing active tuberculosis, and an estimated 10% of TB cases worldwide are attributable to alcohol. For people already weakened by liver disease and malnutrition, these infections can overwhelm the body quickly.
Accidents, Suicide, and Violence
Not all alcohol-related deaths come from chronic disease. A substantial portion are sudden and violent. In a study of injury-related deaths, 31.5% of homicide victims were intoxicated at the time of death, as were 31% of those who died from unintentional injuries and 22.7% of those who died by suicide.
The patterns vary by type of injury. Deaths from burns and hypothermia had the highest intoxication rates, at 41% to 42%. Among suicides, those involving poisoning or firearms had intoxication rates of 35% and 31% respectively. Motor vehicle deaths showed the strongest patterns in men aged 25 to 34. Falls, drownings, and other accidents round out a category that, taken together, represents a major share of alcohol-related mortality, particularly among younger drinkers who haven’t yet developed the chronic diseases that kill older ones.
Alcohol Withdrawal Itself Can Be Fatal
Paradoxically, stopping drinking can also kill. The most severe form of alcohol withdrawal, delirium tremens, involves confusion, hallucinations, seizures, dangerously high blood pressure, and a racing heart. Historically, it killed about 20% of people who developed it. With modern critical care, that rate has dropped to around 1%, but it requires prompt medical treatment. Left untreated, the cardiovascular and neurological stress can be fatal.
Severe thiamine (vitamin B1) deficiency, nearly universal in people with advanced alcohol use disorder, can also trigger a brain condition called Wernicke encephalopathy during or after withdrawal. In its most severe form, this too can be fatal if not treated quickly with thiamine replacement.
Why the Death Toll Is So High
What makes alcohol use disorder so deadly isn’t any single disease. It’s that alcohol damages nearly every organ system simultaneously. A person with cirrhosis often also has a weakened heart, a suppressed immune system, and an elevated cancer risk. These conditions compound one another. A bout of pneumonia that a healthy person would survive can kill someone whose liver is failing and whose heart is already strained. The 24 to 28 years of lost life expectancy reflect this cascade of overlapping damage, not just one fatal illness but a body-wide vulnerability that makes recovery from any serious health event far less likely.