AUD stands for alcohol use disorder, the clinical term doctors use to describe a pattern of drinking that causes significant distress or impairment in a person’s life. It replaced older, less precise labels like “alcohol abuse” and “alcohol dependence” when the diagnostic manual used by mental health professionals was updated in 2013. AUD is diagnosed on a spectrum from mild to severe, based on how many of 11 specific criteria a person meets within a 12-month period.
How AUD Is Diagnosed
A diagnosis of alcohol use disorder requires meeting at least 2 of 11 criteria within the same 12-month window. These criteria cover a wide range of drinking-related problems, from behavioral patterns to physical symptoms. The number of criteria you meet determines severity:
- Mild: 2 to 3 criteria
- Moderate: 4 to 5 criteria
- Severe: 6 or more criteria
This spectrum approach is one of the most important things to understand about AUD. Someone with mild AUD looks very different from someone with severe AUD, and the treatment approach often differs accordingly.
The 11 Criteria
The criteria fall into several broad categories: loss of control, physical dependence, risky use, and social consequences. In the past 12 months, have you:
- Ended up drinking more, or for longer, than you planned?
- Wanted to cut down or stop but couldn’t?
- Spent a lot of time drinking, or recovering from its effects?
- Experienced cravings so strong you couldn’t think of anything else?
- Found that drinking interfered with work, school, or home responsibilities?
- Kept drinking even though it caused problems with family or friends?
- Given up or reduced activities you enjoyed in order to drink?
- Gotten into dangerous situations while or after drinking (driving, unsafe sex, etc.)?
- Continued drinking despite it worsening depression, anxiety, or another health problem, or after a memory blackout?
- Needed significantly more alcohol to feel the same effect (tolerance)?
- Experienced withdrawal symptoms when alcohol wore off, such as shakiness, trouble sleeping, nausea, sweating, a racing heart, or sensing things that weren’t there?
You don’t need to meet all of these. Two is enough for a mild diagnosis. Many people are surprised to learn that behaviors they consider normal, like regularly drinking more than intended or needing more alcohol to feel the same buzz, count as diagnostic criteria.
What Happens in the Brain
AUD isn’t simply a matter of willpower. Chronic heavy drinking physically changes how the brain works. Alcohol floods the brain’s reward circuits with feel-good chemicals, particularly dopamine. Over time, the brain adapts to expect that flood and reduces its natural output, which is why people with AUD often feel flat or anxious when they’re not drinking.
Repeated heavy use also disrupts the parts of the brain responsible for impulse control, decision-making, and emotional regulation. This creates a cycle: the areas of the brain you’d rely on to moderate your drinking are precisely the ones being impaired by it. Chronic drinking can also affect memory, attention, motivation, and sleep regulation, making recovery harder the longer AUD goes untreated.
How Doctors Screen for AUD
Most primary care offices use a quick screening questionnaire called the AUDIT-C, which asks three questions about how often you drink, how much, and how frequently you have six or more drinks on one occasion. A score of 5 or higher flags a potential problem and prompts a more detailed conversation. Scoring below 5 doesn’t guarantee everything is fine, but it moves the issue to your doctor’s discretion rather than requiring a formal follow-up.
The screening itself isn’t a diagnosis. It’s a starting point. A full AUD diagnosis comes from evaluating the 11 criteria listed above, typically through a structured interview with a healthcare provider.
Health Consequences of Untreated AUD
AUD can damage nearly every major organ system in the body. The liver takes the most well-known hit: alcohol-related liver disease progresses from fatty liver (which is reversible) through inflammation and scarring to cirrhosis and liver cancer. But the damage extends far beyond the liver.
Alcohol is the leading cause of chronic pancreatitis and the second leading cause of acute pancreatitis, which can result in severe pain, difficulty absorbing nutrients, and diabetes. It damages the lining of the digestive tract, promoting inflammation in the esophagus, stomach, and intestines and increasing the risk of gastrointestinal bleeding. It raises blood pressure and increases the risk of abnormal heart rhythms.
Severe AUD can cause a dangerous deficiency in thiamine (vitamin B1), leading to a neurological emergency called Wernicke’s encephalopathy, marked by confusion, vision problems, and coordination loss. If untreated, this can progress to Korsakoff syndrome, which causes profound, often irreversible memory impairment.
Alcohol is also a recognized carcinogen. It’s linked to cancers of the mouth, throat, voice box, esophagus, colon, rectum, liver, and breast.
How AUD Is Treated
Treatment depends on severity and ranges from brief counseling for mild cases to intensive programs for severe AUD. Behavioral therapies, including cognitive behavioral therapy and motivational interviewing, form the backbone of most treatment plans.
Three FDA-approved medications can support recovery. One works by reducing the pleasurable effects of alcohol, making it less rewarding to drink. Another helps stabilize brain chemistry that becomes disrupted after someone stops drinking, easing the discomfort of early sobriety. The third takes a different approach entirely: it causes nausea and other unpleasant symptoms if you drink while taking it, creating a strong deterrent.
These medications work best alongside therapy, not as standalone treatments. Support groups, both traditional 12-step programs and newer alternatives, also play a significant role for many people. The mild-to-severe spectrum matters here: someone with mild AUD may respond well to a few counseling sessions and a shift in drinking habits, while severe AUD often requires more structured, longer-term intervention and medical supervision during withdrawal.
Why the Terminology Shift Matters
Before AUD became the standard term, the diagnostic manual split problem drinking into two separate categories: “alcohol abuse” and “alcohol dependence.” This created a confusing gap where some people clearly had drinking problems but didn’t fit neatly into either box. The shift to a single diagnosis on a severity spectrum captures a much wider range of problematic drinking and catches people earlier, when intervention is more effective. If you see AUD on medical paperwork or in a doctor’s notes, it refers to this unified diagnosis and will typically include a severity level (mild, moderate, or severe) to indicate where on the spectrum the condition falls.