Alcohol addiction, clinically called alcohol use disorder (AUD), is defined as an impaired ability to stop or control alcohol use despite negative consequences to your health, relationships, or daily life. It’s not simply drinking a lot. The diagnosis requires meeting at least 2 of 11 specific behavioral and physical criteria within the same 12-month period. Nearly 30 million people aged 12 and older in the United States met that threshold in 2022, yet the condition remains widely undertreated.
The 11 Criteria That Define AUD
The current diagnostic standard uses 11 criteria grouped loosely around loss of control, physical dependence, and life consequences. You don’t need to check every box. Meeting just 2 in the same year qualifies as a diagnosis, with severity scaling from there:
- Mild: 2 to 3 criteria
- Moderate: 4 to 5 criteria
- Severe: 6 or more criteria
The criteria themselves cover a wide range of experiences. Some are about control: drinking more or longer than you intended, wanting to cut down but not being able to, spending a lot of time drinking or recovering from it. Others focus on consequences: failing to meet obligations at work, school, or home because of alcohol, continuing to drink despite relationship problems it causes, or giving up activities you once enjoyed in favor of drinking. Two criteria specifically address physical dependence: needing more alcohol to get the same effect (tolerance) and experiencing withdrawal symptoms when you stop. The final criteria involve craving alcohol and continuing to drink in situations where it’s physically dangerous or despite knowing it’s worsening a health problem.
This means someone with mild AUD might look very different from someone with severe AUD. A person who repeatedly drinks more than they planned and has given up weekend hobbies because of hangovers technically meets the threshold, even if they never experience withdrawal. That breadth is intentional. It captures the full spectrum of problem drinking rather than waiting until someone hits rock bottom.
Binge Drinking and Heavy Drinking Are Not the Same Thing
A common point of confusion is the relationship between heavy drinking and addiction. They overlap, but they aren’t identical. Binge drinking means reaching a blood alcohol concentration of 0.08% in a single session, which typically corresponds to five or more drinks for men or four or more for women within about two hours. Heavy drinking is defined as five or more drinks on any day or 15 or more per week for men, and four or more on any day or eight or more per week for women.
You can be a heavy drinker without having AUD. The difference is whether you’ve lost control over the behavior and whether it’s causing persistent problems in your life. Someone who drinks heavily at social events every weekend but can stop without difficulty or consequences doesn’t meet the diagnostic criteria. Someone who drinks the same amount but finds they can’t cut back when they try, feels anxious when they can’t drink, or keeps drinking after it costs them a job or a relationship is in different territory. Volume matters for health risks, but the core of addiction is the pattern of impaired control and continued use despite harm.
What Happens in the Brain
Alcohol initially works on the brain’s reward system. When you drink, it triggers a release of dopamine and natural opioid-like chemicals in the areas of the brain responsible for motivation and pleasure. This is the same circuitry that responds to food, sex, and other survival-related rewards. In early drinking, this produces the euphoria and relaxation people associate with alcohol.
With repeated heavy use, the brain adapts. The reward system becomes less responsive, so you need more alcohol to feel the same effect. At the same time, the brain’s stress system becomes overactive. A region involved in regulating emotional states becomes increasingly sensitive, which means that when alcohol wears off, you don’t just return to baseline. You feel worse than you did before you started drinking: more anxious, more irritable, more on edge. This creates a cycle where drinking shifts from something that feels good to something that temporarily relieves feeling bad. The brain also adjusts its balance between excitatory and calming signaling. When alcohol is suddenly removed, the excitatory system is left unopposed, which is what drives the physical symptoms of withdrawal.
Physical Signs of Dependence
Physical dependence is one component of AUD, though not everyone with AUD develops it. When the body has adapted to regular alcohol exposure and you suddenly stop or sharply reduce intake, withdrawal symptoms typically begin within 6 to 24 hours. Mild symptoms include headache, anxiety, insomnia, excessive sweating, upset stomach, and shakiness in the hands. More concerning signs include heart palpitations, elevated blood pressure, confusion, and a high body temperature.
In severe cases, withdrawal can cause hallucinations, seizures, and a dangerous condition called delirium. This is why abruptly stopping heavy, long-term drinking without medical support can be genuinely life-threatening, unlike withdrawal from most other substances.
A Quick Self-Check
If you’re wondering whether your drinking qualifies as a problem, the CAGE questionnaire is a widely used four-question screening tool. It asks whether you’ve ever felt you should Cut down on your drinking, whether people have Annoyed you by criticizing it, whether you’ve felt Guilty about it, and whether you’ve ever had a drink first thing in the morning as an Eye-opener. Answering yes to two or more is considered clinically significant and worth following up on with a healthcare provider.
This isn’t a diagnosis. It’s a signal. Many people who score a 2 or higher on the CAGE are surprised by the result because their drinking feels normal within their social circle. That normalcy is part of why AUD is so undertreated.
Long-Term Health Consequences
Chronic heavy alcohol use damages nearly every organ system. The liver takes the most direct hit, progressing through a series of stages: fat buildup, inflammation, scarring (fibrosis), and eventually cirrhosis, where healthy liver tissue is replaced with scar tissue and the organ begins to fail. Liver cancer risk also rises.
The heart is similarly vulnerable. Long-term heavy drinking weakens the heart muscle, raises blood pressure, and increases the risk of irregular heartbeat, heart attack, and stroke. Blood composition changes too, with low red blood cell counts, low white blood cells, and low platelets all common in people with severe AUD.
Alcohol disrupts the immune system, making infections harder to fight and slowing tissue recovery. It damages the lining of the digestive tract, promotes gut inflammation, and increases the risk of acid reflux, esophageal cancer, oral cancer, and colorectal cancer. Nerve damage is common as well, causing numbness in the arms and legs and painful burning sensations in the feet. Hormonal disruption can lead to thyroid problems, abnormal cholesterol, reproductive dysfunction, and an increased risk of type 2 diabetes.
How AUD Is Treated
Treatment for alcohol use disorder generally combines behavioral therapy with medication. Three main medications are used in the U.S. to help people either reduce drinking or maintain abstinence. One works by blocking the pleasurable effects of alcohol, making drinking less rewarding. Another helps stabilize brain chemistry that’s been disrupted by chronic drinking, reducing the discomfort that drives relapse. A third creates an unpleasant physical reaction (flushing, nausea, rapid heartbeat) if you drink while taking it, which serves as a deterrent rather than addressing the underlying craving.
The goal of treatment isn’t always total abstinence. For some people, particularly those with mild or moderate AUD, a realistic and medically supported goal is reducing consumption to a level that no longer causes harm. Treatment works best when it addresses both the biological and behavioral sides of the disorder, since AUD involves learned patterns of coping and decision-making alongside the neurological changes that make quitting difficult. Recovery timelines vary widely: some people respond quickly, while others cycle through multiple treatment approaches before finding what works.