Alcoholism, now clinically called alcohol use disorder (AUD), is a medical condition in which a person loses reliable control over their drinking despite negative consequences to their health, relationships, or daily life. It is not simply drinking too much or too often. The defining feature is a persistent pattern where drinking takes priority over things that once mattered, and cutting back feels difficult or impossible even when the person wants to.
How Alcohol Use Disorder Is Diagnosed
Clinicians diagnose AUD using a checklist of 11 criteria. If a person meets two or more within a 12-month period, they qualify for a diagnosis. Meeting 2 to 3 criteria is considered mild, 4 to 5 is moderate, and 6 or more is severe. The criteria cover three broad areas: loss of control, physical dependence, and continued use despite harm.
The 11 criteria, written as questions, include: drinking more or longer than you intended; wanting to cut down but being unable to; spending a large amount of time drinking or recovering from it; craving alcohol so intensely you can’t think of anything else; drinking interfering with responsibilities at home, work, or school; continuing to drink even though it causes problems with family or friends; giving up activities you used to enjoy in order to drink; getting into risky situations while or after drinking; continuing to drink despite worsening depression, anxiety, or other health problems; needing more alcohol to feel the same effect (tolerance); and experiencing withdrawal symptoms like shakiness, sweating, nausea, or insomnia when alcohol wears off.
You don’t need to check every box. Someone who regularly drinks more than they planned, has tried unsuccessfully to cut back, and has given up hobbies to make time for drinking already meets the threshold for mild AUD.
Binge Drinking vs. Alcoholism
Binge drinking and alcoholism are related but not the same thing. Binge drinking is defined as four or more drinks for women, or five or more for men, in a single sitting. Heavy drinking is eight or more drinks per week for women, or 15 or more for men. Both patterns increase the risk of developing AUD, but many people who binge drink do not have a diagnosable disorder. The distinction comes down to control and consequences: a person who occasionally overdoes it at a party but can easily go weeks without drinking is in a different situation than someone who repeatedly tries to moderate and fails.
What Happens in the Brain
Alcoholism involves real changes in brain chemistry, which is why willpower alone often isn’t enough to stop. When you drink, alcohol triggers a release of dopamine in the brain’s reward center, creating feelings of pleasure and relaxation. Over time, the brain starts associating the people, places, and even glassware linked to drinking with that reward. Those cues begin to trigger powerful urges on their own.
With repeated heavy drinking, the brain shifts control over drinking behavior from the prefrontal cortex, which handles decision-making and impulse control, to regions that govern automatic habits. Drinking starts to feel less like a choice and more like a reflex. Meanwhile, the brain’s reward system becomes dulled, so everyday pleasures like food, exercise, or socializing feel less satisfying. The person needs alcohol just to feel normal.
When someone with this level of dependence stops drinking, the brain’s stress circuits go into overdrive. Irritability, anxiety, and emotional pain flood in. This creates a cycle: drinking to feel good becomes drinking to avoid feeling terrible, which drives more drinking, which deepens the brain changes.
How It Progresses
Alcoholism rarely appears overnight. The cycle typically moves through three reinforcing stages. In the first stage, drinking produces rewarding effects like euphoria and reduced anxiety. The brain learns to associate those rewards with specific triggers, and habits form. In the second stage, when the person isn’t drinking, withdrawal symptoms and a flattened emotional state take over. Sleep gets disrupted, anxiety spikes, and ordinary life feels joyless. The third stage involves preoccupation: spending mental energy planning the next drink, struggling to focus on anything else, and losing the ability to weigh long-term consequences against short-term relief.
These stages feed each other and can accelerate. Someone who started as a social drinker may progress over months or years to a point where drinking is the organizing principle of their day.
Genetics and Risk Factors
About 50% of the risk for developing AUD is genetic. Twin and family studies consistently show a heritability of roughly 0.50, meaning half of the vulnerability comes from your DNA and half from environment, behavior, and life circumstances. Researchers have identified over 100 genetic variants linked to the disorder, many of them affecting how your body processes alcohol or how your brain responds to its effects.
One well-studied example involves variations in the genes responsible for breaking down alcohol. Some people carry gene variants that cause alcohol to be metabolized into a toxic byproduct more quickly, leading to flushing, nausea, and discomfort. This actually protects against heavy drinking. Other variants affect receptors in the brain tied to pleasure, stress, and habit formation, making some individuals more susceptible to the reinforcing effects of alcohol.
Having a family history of alcoholism doesn’t guarantee you’ll develop it, but it does mean your threshold for developing dependence is lower.
Physical Health Effects
Long-term heavy drinking damages nearly every organ system. The liver bears the earliest and heaviest burden, progressing through stages of fatty buildup, inflammation, scarring (fibrosis), and eventually cirrhosis, where the liver loses its ability to function. Chronic alcohol use also inflames the pancreas, impairing digestion and blood sugar regulation.
The heart and circulatory system suffer too. Heavy drinking weakens the heart muscle, raises blood pressure, and increases the risk of irregular heartbeat and heart attack. Blood composition changes: red blood cell counts drop, white blood cells decline, and platelets fall, making it harder to fight infections and stop bleeding.
Nerve damage is common, particularly in the hands and feet, causing numbness and painful burning sensations. The endocrine system becomes disrupted, leading to hormonal imbalances that can affect thyroid function, cholesterol levels, reproductive health, and blood sugar control. Heavy drinking also weakens bones, wastes muscle, and increases the frequency of gout attacks.
What Withdrawal Looks Like
For someone who has been drinking heavily for a prolonged period, stopping suddenly can be dangerous. Withdrawal symptoms typically begin within 6 to 24 hours after the last drink. The earliest signs are mild: headache, anxiety, and difficulty sleeping. Within 24 hours, some people experience hallucinations. Symptoms generally peak between 24 and 72 hours.
The most severe form of withdrawal, delirium tremens, can appear 48 to 72 hours after the last drink and involves confusion, rapid heartbeat, fever, and seizures. Between 5% and 10% of people who develop delirium tremens die from it, which is why medically supervised detox is important for anyone with a long history of heavy drinking.
A Simple Self-Check
A widely used screening tool called the AUDIT-C asks just three questions. First: how often do you have a drink containing alcohol? (Scored from 0 for never to 4 for four or more times a week.) Second: how many drinks do you have on a typical drinking day? (Scored from 0 for one or two to 4 for ten or more.) Third: how often do you have six or more drinks on one occasion? (Scored from 0 for never to 4 for daily or almost daily.)
A total score of 4 or higher for men, or 3 or higher for women, suggests hazardous drinking or a possible alcohol use disorder. It’s not a diagnosis, but it’s a useful starting point for an honest conversation with yourself or a healthcare provider.
Treatment Options
Because alcoholism involves physical changes in the brain, treatment works best when it addresses both the biological and behavioral sides. Three medications are currently approved for AUD. One blocks the pleasure signals alcohol produces, reducing cravings. Another calms the brain’s hyperexcitability during early sobriety, easing anxiety and restlessness. A third causes unpleasant reactions like nausea and skin flushing if a person drinks while taking it, creating a deterrent.
Behavioral treatments, including cognitive behavioral therapy and mutual support groups, help people identify triggers, build coping strategies, and restructure daily routines around sobriety. Many people benefit from a combination of medication and behavioral support. Recovery timelines vary widely. Some people respond quickly, while others cycle through periods of sobriety and relapse before finding a stable footing. Relapse is common and doesn’t mean treatment has failed. It means the approach needs adjusting.