Alcohol Addiction: Signs, Effects and Withdrawal

This page covers how alcohol use disorder is diagnosed against the eleven DSM-5-TR criteria and the signs that identify it. It also covers what sustained heavy drinking does to the body, why withdrawal carries seizure risk, and what treatment involves.

Key Takeaways

• Alcohol use disorder is diagnosed against 11 DSM-5-TR criteria over a 12-month period, with 2 to 3 criteria classed as mild, 4 to 5 as moderate and 6 or more as severe.
• 27.9 million people in the United States had alcohol use disorder in the past year, according to SAMHSA's 2024 National Survey on Drug Use and Health.
• Alcohol withdrawal and benzodiazepine withdrawal are both life-threatening withdrawal syndromes. Opioid withdrawal, by contrast, is rarely fatal.
• Delirium tremens carries a mortality of roughly 1% to 4%, and the risk window opens 24 to 72 hours after the last drink.
• Montana adults report binge drinking at 19.5% against a national 15.2%, and alcohol was the primary substance for 66.7% of Montanans entering substance use treatment in 2024.

What is alcohol use disorder?

Alcohol use disorder is the DSM-5-TR diagnosis for a pattern of drinking that causes clinically significant impairment or distress, established by meeting at least two of eleven criteria within a twelve-month period. The count of criteria met sets severity rather than the volume consumed.

Alcohol occupies a position no other drug does. It is sold in supermarkets, poured at weddings and funerals, and treated as the default social lubricant, which makes dependence on it uniquely easy to miss. A person meets the diagnostic threshold for alcohol use disorder for years while holding a job, raising children and never once being described by anyone as having a problem.

That normalization obscures a clinical fact that separates alcohol from most other substances. Alcohol withdrawal is a life-threatening withdrawal syndrome, as is withdrawal from benzodiazepines. Opioid withdrawal is severe and rarely fatal. Alcohol withdrawal is sometimes quieter at onset and ends in seizures or delirium tremens.

The American Psychiatric Association groups the eleven criteria into four clusters. Impaired control covers drinking more or longer than intended, wanting to cut down without managing it, spending large amounts of time obtaining or recovering from alcohol, and craving. Social impairment covers failure to meet obligations, continued drinking despite interpersonal problems, and giving up activities. Risky use covers drinking in physically hazardous situations and continuing despite a known physical or psychological problem. Pharmacological criteria cover tolerance and withdrawal.

Severity follows directly from the count. Two to three criteria indicate mild alcohol use disorder, four to five indicate moderate, and six or more indicate severe. A person who drinks a bottle of wine nightly without meeting two criteria does not have the diagnosis. A person who drinks considerably less but has tried repeatedly to stop, drinks before work, and shakes in the morning does.

The older vocabulary of alcoholism, alcohol abuse and alcohol dependence was retired when the DSM-5 merged abuse and dependence into a single graded disorder in 2013. Clinical documentation, insurance authorization and treatment planning all now run on alcohol use disorder and its severity rating.

• 11 DSM-5-TR criteria for alcohol use disorder (APA, DSM-5-TR (2022))
• 2 criteria in 12 months to establish the diagnosis (APA, DSM-5-TR (2022))
• 27.9M people aged 12+ with past-year alcohol use disorder (SAMHSA NSDUH, 2024)

Scale matters for how the condition is read. SAMHSA's 2024 National Survey on Drug Use and Health found that 27.9 million people aged 12 and older met criteria for alcohol use disorder in the past year. That sits within a total of nearly 50 million people who met criteria for any substance use disorder. Alcohol use disorder is the single most common substance use disorder in the country, which is the context in which its signs are so routinely overlooked.

What are the signs of alcohol use disorder?

The signs of alcohol use disorder fall into three groups. Behavioral signs include concealment and failed attempts to cut down, physical signs include morning tremor and rising tolerance, and cognitive signs include blackouts and preoccupation with drinking.

Behavioral signs appear first and are the ones other people notice. 5 behavioral indicators clinicians screen for during assessment:

• Drinking more, or for longer, than the person intended on most occasions
• Failing at repeated attempts to cut down or stop
• Concealing the quantity consumed, or drinking before a social event
• Structuring the day around when drinking becomes acceptable
• Continuing to drink after alcohol has caused an argument, an injury or a missed obligation

Physical signs indicate that the central nervous system has adapted. Tolerance means the same quantity produces less effect, so intake climbs to hold the effect steady. Morning tremor, sweating and nausea that resolve after a drink are withdrawal, and withdrawal relieved by drinking is the clearest single indicator of physical dependence. Sleep fragments, because alcohol sedates on the way in and produces rebound arousal several hours later as blood alcohol falls.

Cognitive signs are the least visible and the most diagnostic. Blackouts are episodes in which the hippocampus fails to lay down memory while the person remains awake, walking and talking. A blackout is not passing out. It is a discrete alcohol-induced amnesia, and it indicates a blood alcohol concentration that rose fast.

Employment and family stability conceal all of this for years in many people, which is the pattern examined on the page about the high-functioning alcoholic. The absence of visible consequences is not evidence that the disorder is absent, and the physical damage accumulates on its own schedule.

What does sustained heavy drinking do to the body?

Sustained heavy drinking damages the liver, the brain, the heart, the pancreas and the gastrointestinal tract, and raises the risk of at least seven cancers. Liver injury progresses through steatosis and alcoholic hepatitis to cirrhosis, and the earlier stages reverse with abstinence.

The liver metabolizes the great majority of ingested alcohol and absorbs most of the injury. Fat accumulates in hepatocytes within days of heavy drinking, producing hepatic steatosis, which is asymptomatic and fully reversible. Continued drinking drives inflammation, and a proportion of people progress to alcoholic hepatitis and then to cirrhosis, in which functional tissue is replaced by scar. The progression is covered in detail on the page about alcoholic liver disease.

Breath, blood, urine and hair tests each have their own alcohol detection window.

The brain sustains two distinct kinds of damage. Alcohol suppresses glutamate signalling and enhances GABA signalling, and the brain compensates by upregulating glutamate receptors and downregulating GABA receptors. That adaptation is what makes withdrawal dangerous. Separately, chronic heavy drinking impairs thiamine absorption, and thiamine deficiency produces Wernicke encephalopathy and, untreated, the largely irreversible amnestic state of Korsakoff syndrome.

Cardiovascular effects include hypertension, atrial fibrillation and alcoholic cardiomyopathy, in which the heart muscle dilates and contractile force falls. The pancreas develops acute and then chronic pancreatitis. The gastrointestinal tract develops gastritis and esophageal varices secondary to portal hypertension, and variceal bleeding is a medical emergency.

Montana carries this burden at scale. The Montana Department of Public Health and Human Services recorded 2,941 alcohol-related deaths in the state between 2019 and 2023, against 1,563 between 2009 and 2013, close to a doubling in a decade. In 2023 alone, Montana hospitals charged over $222 million for 16,914 alcohol-related hospitalizations and emergency department visits. Those figures count disease and injury. They do not count the risk that arrives at the moment a person decides to stop.

Why is alcohol withdrawal dangerous?

Alcohol withdrawal is dangerous because the brain has upregulated glutamate signalling to counteract alcohol's sedative effect, and removing alcohol leaves that excitatory system unopposed. The resulting hyperexcitability produces seizures in a minority of cases and delirium tremens in a smaller minority.

Withdrawal severity tracks the degree of neuroadaptation rather than the person's character or motivation. Someone who has drunk heavily and daily for years, who has been through withdrawal before, or who is medically unwell carries higher risk. Prior withdrawal episodes matter independently, because repeated withdrawal sensitises the brain through a kindling effect, and each subsequent episode tends to be worse than the last.

Two complications define the danger. Withdrawal seizures are generalized tonic-clonic seizures that arrive in clusters. Schwebach and Vempati reported in their 2023 case study in the Journal of Education & Teaching in Emergency Medicine that up to 3% of these progress to status epilepticus. Status epilepticus is a continuous seizure state that is itself life-threatening.

Delirium tremens is the more feared outcome. It combines profound confusion, hallucinations, agitation and autonomic instability, meaning a racing heart, high blood pressure and fever. Schwebach and Vempati put mortality at roughly 1% to 4% once withdrawal progresses to delirium tremens. Untreated, historical figures run far higher, which is the entire argument for medical supervision.

Clinicians score severity with the CIWA-Ar, the revised Clinical Institute Withdrawal Assessment for Alcohol, developed by Sullivan and colleagues and published in the British Journal of Addiction in 1989. The instrument rates ten items, including tremor, sweating, anxiety, agitation and hallucinations, and the total score drives symptom-triggered benzodiazepine dosing. Benzodiazepines restore the GABA signalling that alcohol was providing, then taper down in a controlled way instead of vanishing overnight.

Risk is not constant across the withdrawal period. It concentrates in a specific window, which is why the timeline matters clinically.

How long does alcohol withdrawal last?

Alcohol withdrawal begins within 6 to 12 hours of the last drink, and most acute symptoms resolve within several days. Hallucinosis appears at 8 to 12 hours, seizures cluster at 12 to 24 hours, and delirium tremens opens at 24 to 72 hours.

The following stages are the sequence documented by Schwebach and Vempati in the Journal of Education & Teaching in Emergency Medicine in 2023.

Alcohol hallucinosis is distinguished from delirium tremens by orientation. A person in hallucinosis knows who and where they are while perceiving things that are not present. A person in delirium tremens does not, and that loss of orientation is what marks the escalation.

Saitz, writing in the NIAAA journal Alcohol Health and Research World, notes that most acute symptoms resolve several hours to several days after they appear. A subset of people then experience protracted withdrawal, with disturbed sleep, low mood, irritability and intermittent craving persisting for weeks or months as receptor systems return towards baseline. Protracted withdrawal is the last stage of the alcohol withdrawal timeline.

Detoxification ends the physical dependence. It does not treat the disorder that produced it, and the distinction shapes everything that follows.

How is alcohol use disorder treated?

Alcohol use disorder is treated in two connected stages: medically supervised withdrawal management to get a person through detoxification safely, then structured treatment combining behavioral therapy, medication and recovery support to address the disorder itself.

Withdrawal management is the acute phase. Benzodiazepines are the first-line medication, dosed against CIWA-Ar scores, alongside thiamine to prevent Wernicke encephalopathy, fluid and electrolyte correction, and monitoring of vital signs. The American Society of Addiction Medicine describes medically monitored inpatient withdrawal management as ASAM Level 3.7, the level at which 24-hour nursing and daily physician availability are present without a full hospital.

Behavioral treatment carries the longer work. Cognitive behavioral therapy targets the thoughts and situations that precede drinking. Motivational interviewing addresses ambivalence, which is close to universal at intake. Family therapy addresses the relationships that both suffer from and shape the drinking. Three medications hold FDA approval for alcohol use disorder: naltrexone, acamprosate and disulfiram.

Two investigational approaches sit behind those three. Semaglutide, a GLP-1 receptor agonist licensed for diabetes and obesity, reduced laboratory alcohol self-administration in a phase 2 randomized trial reported by Hendershot and colleagues, and it holds no FDA approval for alcohol use disorder. Psilocybin-assisted therapy has also reached phase 2, and the evidence conflicts. Rieser and colleagues found no significant advantage over placebo for relapse prevention at six months.

Treatment intensity is matched to need rather than preference. Someone with severe alcohol use disorder, a history of withdrawal seizures and an unstable home has different requirements from someone with moderate alcohol use disorder and strong support around them. That matching decision is the ASAM level-of-care assessment, and it is made clinically, at intake.

In Montana, alcohol is the dominant reason people enter treatment at all. The Montana Department of Public Health and Human Services reported that 66.7% of Montanans receiving substance use disorder treatment in 2024 named alcohol as their primary substance, with a further 8.4% naming it as secondary. Alcohol is not a secondary concern in this state's treatment system. It is the main one, and the wider picture is set out on the page on addiction in Montana.

Frequently asked questions

Sources

1. American Psychiatric Association (2022). Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR). Criteria and severity thresholds for alcohol use disorder.
2. Substance Abuse and Mental Health Services Administration (2025). Key Substance Use and Mental Health Indicators in the United States: Results from the 2024 National Survey on Drug Use and Health. Past-year alcohol use disorder prevalence.
3. Saitz, R. (1998). Introduction to alcohol withdrawal, Alcohol Health and Research World, 22(1), 5-12. Resolution of acute withdrawal symptoms within hours to days.
4. Schwebach, Courtney and Vempati, Amrita (2023). Alcohol Withdrawal with Delirium Tremens, Journal of Education & Teaching in Emergency Medicine. Withdrawal timeline, seizure progression and delirium tremens mortality.
5. Sullivan, John T. et al. (1989). Assessment of alcohol withdrawal: the revised Clinical Institute Withdrawal Assessment for Alcohol scale (CIWA-Ar), British Journal of Addiction. Withdrawal severity scoring.
6. Montana Department of Public Health and Human Services (2025). Alcohol Use in Montana. Alcohol-related deaths, hospitalization charges, treatment admissions and BRFSS binge-drinking comparisons.
7. American Society of Addiction Medicine. The ASAM Criteria. Definitions of levels of care, including Level 3.7 medically monitored intensive inpatient services.
8. Hendershot, C. S. et al. (2025). Once-Weekly Semaglutide in Adults With Alcohol Use Disorder: A Randomized Clinical Trial, JAMA Psychiatry, 82(4), 395-405. Phase 2 evidence for GLP-1 receptor agonists in alcohol use disorder.
9. Rieser, N. M. et al. (2025). Psilocybin-assisted therapy for relapse prevention in alcohol use disorder: a phase 2 randomized clinical trial, eClinicalMedicine, 82, 103149. Null result for relapse prevention at six months.