An alcoholic is a person who has lost reliable control over their drinking despite negative consequences in their health, relationships, or daily life. The clinical term used today is alcohol use disorder (AUD), a medical condition diagnosed when someone meets at least 2 of 11 specific criteria within a 12-month period. The word “alcoholic” is still widely understood, but the shift in terminology reflects an important idea: this is a diagnosable brain condition, not a character flaw.
How Alcohol Use Disorder Is Defined
The diagnostic manual used by mental health professionals lists 11 symptoms that define AUD. You don’t need all of them. Meeting just 2 within a single year qualifies as a diagnosis. The symptoms fall into a few broad patterns: losing control over how much or how often you drink, continuing to drink even when it causes clear problems, and developing physical dependence.
The specific criteria include drinking more than you intended, wanting to cut back but failing to do so, spending a large chunk of time obtaining alcohol or recovering from its effects, experiencing strong cravings, and neglecting responsibilities at work, school, or home because of drinking. It also counts if you’ve given up hobbies or social activities you used to enjoy, if you keep drinking in physically dangerous situations, or if you continue despite knowing it’s worsening a physical or mental health problem. The final two criteria are tolerance (needing more alcohol to feel the same effect) and withdrawal (experiencing symptoms like shakiness, nausea, or sweating when you stop).
Severity is graded by how many criteria you meet. Two or three symptoms is considered mild. Four or five is moderate. Six or more is severe. This spectrum matters because many people picture an “alcoholic” as someone whose life has completely fallen apart, when in reality the condition often starts quietly and gets worse over time.
What Happens in the Brain
Alcohol changes brain chemistry in ways that, over time, make it genuinely difficult to stop. When you drink, your brain releases dopamine, the chemical tied to pleasure and motivation. Even anticipating a drink can trigger dopamine release. With repeated exposure, the brain recalibrates. It starts producing less dopamine on its own, so you feel flat or low when you’re not drinking. This creates a powerful pull back toward alcohol just to feel normal.
At the same time, alcohol amplifies the activity of your brain’s main calming chemical (GABA) and suppresses its main excitatory chemical (glutamate). The net effect is sedation and relaxation. But after chronic use, the brain compensates by dialing down its calming systems and ramping up its excitatory ones. When alcohol is suddenly removed, the brain is left in an overexcited state. That’s why withdrawal can produce anxiety, tremors, and in severe cases, seizures. The brain has physically adapted to expect alcohol.
Serotonin, a chemical linked to mood and impulse control, is also affected. Chronic drinking depletes serotonin levels, which can increase impulsivity and make it harder to resist the urge to drink. During withdrawal, serotonin drops further, and some people find temporary relief only by drinking again, reinforcing the cycle.
Genetics and Risk Factors
A large meta-analysis of twin and adoption studies estimated that AUD is roughly 50% heritable. That means about half of a person’s vulnerability comes from their genes, while the other half comes from environmental factors like stress, trauma, social environment, and how early in life they started drinking. Shared family environment (growing up in the same household) accounts for about 10% of the risk, which is relatively small compared to the genetic contribution.
Having a parent or sibling with AUD doesn’t guarantee you’ll develop it, but it does meaningfully raise the odds. If you have a first-degree relative with the condition, your statistical risk of developing it is roughly 35% correlated with theirs, with about two-thirds of that shared risk coming from genetics and one-third from growing up in the same environment.
Warning Signs to Recognize
Because AUD exists on a spectrum, early signs can be easy to rationalize. A few patterns are worth paying attention to:
- Drinking more than planned. You intend to have two drinks and consistently end up having five or six.
- Failed attempts to cut back. You’ve told yourself you’d drink less this week, this month, or this year, and it hasn’t stuck.
- Craving. You find yourself thinking about your next drink during the day, or feeling restless until you can have one.
- Increased tolerance. The amount that used to give you a buzz barely registers now.
- Withdrawal symptoms. You feel shaky, anxious, nauseous, or sweaty when you haven’t had a drink in several hours.
- Social withdrawal. Activities you used to enjoy have quietly been replaced by drinking, or you avoid situations where alcohol isn’t available.
A simple screening tool called the CAGE questionnaire asks four questions that can flag a potential problem: Have you ever felt you should cut down on your drinking? Have people annoyed you by criticizing your drinking? Have you ever felt guilty about your drinking? Have you ever had a drink first thing in the morning to steady your nerves or get rid of a hangover? Answering yes to two or more suggests a pattern worth taking seriously.
What Withdrawal Looks Like
For people who have been drinking heavily for an extended period, stopping abruptly can be dangerous. Early withdrawal symptoms typically begin about 6 hours after the last drink and can last up to 48 hours. These include anxiety, tremors, nausea, insomnia, and a rapid heartbeat.
Seizures can appear between 6 and 48 hours after the last drink. Hallucinations, which can be visual, auditory, or tactile, may develop during moderate withdrawal and can last up to 6 days. The most severe form, delirium tremens, typically begins 48 to 72 hours after the last drink and can persist for up to 2 weeks. It involves confusion, agitation, fever, and cardiovascular instability, and it can be life-threatening without medical supervision. This is why people with heavy, long-term alcohol use should not attempt to quit cold turkey without professional support.
How AUD Is Treated
Treatment typically combines medical and behavioral approaches. Three FDA-approved medications target different parts of the addiction cycle. One works by blocking the receptors responsible for the pleasurable effects of drinking, which reduces cravings and makes alcohol less rewarding. Another eases the brain’s hyperexcitability during early recovery by calming glutamate activity, helping people get through the discomfort of quitting. A third causes unpleasant physical reactions (nausea, flushing) if you drink while taking it, creating a deterrent.
Behavioral treatments range from one-on-one therapy to group-based programs. Cognitive behavioral therapy helps people identify the situations and thought patterns that lead to drinking and develop alternative responses. Motivational interviewing helps people who are ambivalent about change find their own reasons to pursue recovery. Mutual support groups provide accountability and community. No single approach works for everyone, and many people benefit from combining medication with some form of counseling or peer support.
Why the Language Is Changing
You’ll still hear the word “alcoholic” in everyday conversation, and many people in recovery use it to describe themselves. But in clinical and public health settings, there’s been a deliberate move toward person-first language: “person with alcohol use disorder” rather than “alcoholic.” The reasoning isn’t just about politeness. Research shows that stigmatizing labels change how medical professionals perceive and treat patients. One study found that the language used in a patient’s chart influenced prescribing patterns, meaning the words a doctor read about a patient affected the care that patient received.
Stigma also affects whether people seek help in the first place. When the public conversation frames addiction as a moral failing, people with AUD are less likely to pursue treatment, less likely to stick with it, and less likely to believe recovery is possible. Framing AUD as a medical condition with biological roots and effective treatments doesn’t excuse harmful behavior, but it does make it more likely that people will get the help that works.