Alcohol use disorder (AUD) is a medical condition defined by a pattern of drinking that causes significant problems in your life and that you find difficult to control, even when it’s causing harm. It replaced the older terms “alcohol abuse” and “alcohol dependence” in 2013, when the diagnostic manual used by clinicians merged them into a single diagnosis with a severity scale. To be diagnosed, you need to meet at least 2 of 11 specific criteria within a 12-month period.
Why the Name Changed
Before 2013, clinicians split problem drinking into two separate diagnoses: alcohol abuse and alcohol dependence. That system had real problems. Research showed the assumptions behind the split didn’t hold up, and the two-category approach left some people with serious drinking problems falling through the cracks, not quite meeting the threshold for either diagnosis. The word “abuse” also carried stigma, and “dependence” was constantly confused with physical dependence, which is a different thing entirely. The current system uses a single diagnosis, alcohol use disorder, with mild, moderate, and severe classifications based on how many symptoms you have.
The 11 Diagnostic Criteria
A clinician evaluates whether you’ve experienced any of the following within the past year:
- Drinking more, or for longer, than you intended
- Wanting to cut down or stop but not being able to
- Spending a lot of time drinking or recovering from drinking
- Experiencing cravings or strong urges to drink
- Drinking interfering with responsibilities at work, school, or home
- Continuing to drink even though it’s causing relationship problems
- Giving up activities you used to enjoy because of drinking
- Drinking in situations where it’s physically dangerous
- Continuing to drink despite a physical or mental health problem it’s making worse
- Needing more alcohol to get the same effect (tolerance)
- Experiencing withdrawal symptoms when you stop, or drinking to avoid them
Two to three symptoms qualifies as mild AUD. Four to five is moderate. Six or more is severe. This spectrum matters because it means AUD isn’t an all-or-nothing diagnosis. Someone who consistently drinks more than they intend and has repeatedly failed to cut back already meets the threshold for mild AUD, even if they’ve never experienced withdrawal.
What Happens in the Brain
Alcohol activates the brain’s reward system, triggering a release of chemicals that produce pleasure and relaxation. Over time, the brain adapts. The same reward pathways that lit up easily with a couple of drinks begin to require more alcohol to produce the same effect. That’s tolerance at the neurological level.
When someone with chronic heavy use stops drinking, those adapted pathways don’t bounce back immediately. The brain’s reward chemistry is disrupted, creating what researchers describe as a “reward deficit.” Everyday pleasures feel muted. Stress responses become amplified. This combination of flattened pleasure and heightened anxiety is what drives much of the compulsive drinking in later stages. It’s not simply a matter of willpower. The brain has physically reorganized around alcohol’s presence.
Risk Factors
Genetics account for roughly 50 to 60 percent of your risk for developing AUD. If you have a parent or sibling with the condition, your chances are meaningfully higher. But genes alone don’t determine outcomes. A large study from Yale School of Medicine found that environmental influences, including education level, income, early household exposure to substance use, and sex, explained the majority of detectable risk in a clinical setting. In some populations, environment accounted for as much as 73% of the variation in who developed AUD and who didn’t.
Mental health conditions also play a significant role. Depression, anxiety, PTSD, and other psychiatric disorders frequently co-occur with AUD, and they can feed each other in both directions.
How It Affects the Body
Chronic heavy drinking damages nearly every major organ system. The liver takes the most direct hit, progressing through a predictable sequence: fat buildup, inflammation, scarring (fibrosis), and eventually cirrhosis, where the liver is so damaged it can’t function properly. Liver cancer is a further risk.
The cardiovascular system suffers too. Long-term heavy drinking weakens the heart muscle, raises blood pressure, and increases the risk of irregular heartbeat, narrowed arteries, and heart attack.
Cancer risk is one of the less widely known consequences. The U.S. Department of Health and Human Services classifies alcohol as a known human carcinogen. Clear links exist between drinking and cancers of the mouth, throat, esophagus, liver, breast, and colon. The breast cancer connection is particularly striking: even one drink per day raises a woman’s risk by 5 to 15 percent compared to not drinking at all. Binge drinking (four or more drinks in one sitting for women, five or more for men) increases cancer risk even in people who don’t drink daily.
What Counts as a Standard Drink
In the United States, one standard drink contains about 14 grams of pure alcohol. That’s a 12-ounce beer at 5% alcohol, a 5-ounce glass of wine at 12%, or a 1.5-ounce shot of liquor at 40%. Many people underestimate how much they’re drinking because poured glasses of wine are often larger than 5 ounces, craft beers frequently exceed 5% alcohol, and cocktails can contain two or three standard drinks in a single glass.
How It’s Screened
The most commonly used screening tool in primary care is the AUDIT-C, a three-question questionnaire that asks how often you drink, how many drinks you have on a typical day, and how often you have six or more drinks on one occasion. A score of 4 or higher for men, or 3 or higher for women, flags a potential problem worth exploring further. It takes less than a minute to complete and is often built into routine health visits.
Treatment Options
Two main approaches have strong evidence behind them: behavioral therapy and medication. Research shows they’re roughly equally effective, and combining them tends to improve results.
Behavioral Therapy
Cognitive behavioral therapy helps you identify the specific thoughts, feelings, and situations that trigger heavy drinking, then build practical skills to handle those triggers differently. It’s structured and goal-oriented. Motivational enhancement therapy takes a different approach, working over a shorter period to help you build your own internal motivation for change and develop a concrete plan for altering your drinking behavior. Both are delivered by trained therapists and can work in individual or group settings.
Medications
Three medications are approved for treating AUD. One blocks the pleasurable effects of alcohol by interfering with the brain’s opioid system, which reduces both euphoria and cravings. It’s available as a daily pill or a monthly injection. A second medication helps restore the brain’s chemical balance after someone stops drinking, easing the discomfort that often leads to relapse. The third takes a completely different approach: it causes nausea, flushing, and other unpleasant reactions if you drink while taking it, creating a powerful deterrent. It doesn’t reduce cravings, so it works best for people who are already motivated to stop.
None of these medications are addictive, and none require you to be in a residential program. They can be prescribed by a primary care physician, which means treatment doesn’t necessarily require a specialist or a rehab facility. Many people with mild or moderate AUD respond well to outpatient treatment that fits around their regular life.