Alcohol use disorder: signs, causes and treatment

Key points

• Alcohol use disorder is a range, not one condition: hazardous drinking, harmful drinking and alcohol dependence [1][4].
• A person need not be at the severe end to benefit from help. Brief advice in primary care works before dependence develops [4].
• Anyone physically dependent on alcohol should not stop suddenly on their own. Severe withdrawal can involve seizures, confusion and hallucinations, and can be fatal [1][4][8].
• Depression and anxiety run both ways with heavy drinking, and often settle within weeks of stopping [4].
• NICE guideline CG115 covers assisted withdrawal, psychological therapies and relapse prevention medication [3][4].

What alcohol use disorder is

Alcohol use disorder is drinking alcohol in a way that is harmful [1]. It covers a range: hazardous drinking raises the risk of future harm, harmful drinking is already damaging physical or mental health, and alcohol dependence means the body has adapted to alcohol so that stopping brings on withdrawal symptoms [1][4]. People sometimes call it alcoholism [1].

If you need help now. Do not stop drinking suddenly if you are physically dependent on alcohol. The NHS states this can be very dangerous, and Alcohol Change UK states that clinically dependent people can die if they stop abruptly [1][8]. If you get withdrawal symptoms, get medical help before you try to stop [2]. Speak to a GP or a local alcohol service first. Drinkline: 0300 123 1110 [6]. Samaritans: call 116 123, free, 24/7 [9]. Shout: text SHOUT to 85258, free, 24/7 [10]. NHS 111, then the mental health option. Call 999 if anyone is in immediate danger.

The UK Chief Medical Officers advise both men and women not to drink more than 14 units a week regularly, spread across three or more days [5].

UK prevalence data is dated: NICE cites 4% of adults in England as alcohol dependent, about 1.1 million people in 2000, rising to about 1.6 million by 2007 [4]. No newer figure appears in these sources.

Symptoms

The NHS lists these recognised signs [1].

Drinking behaviour - Regularly drinking more than intended, and difficulty cutting down despite wanting to [1]. - Cravings, such as needing a drink on waking [1]. - Needing more alcohol for the same effect, called tolerance [1].

Mood and daily life - Guilt or remorse after drinking, or other people raising concerns about it [1]. - Carrying on despite harm to health, work or relationships [1].

Physical dependence - Withdrawal on stopping or cutting down: anxiety, poor sleep, nausea and vomiting, a racing heartbeat, sweating and shaking, hallucinations, confusion and seizures [1]. - Withdrawal usually starts within 6 to 12 hours of the last drink and lasts about 3 to 7 days [1]. Some withdrawal effects persist as a protracted withdrawal syndrome, taking between three months and a year to resolve fully [4].

It is commonly confused with ordinary heavy social drinking, and with depression or anxiety alone. Depression, anxiety, drug misuse, nicotine dependence and self-harm are all common alongside excessive drinking [4].

Types

Alcohol use disorder is described in bands of severity rather than distinct subtypes [4].

• Hazardous drinking. Patterns that raise the risk of harm with no current evidence of damage, placed by NICE at roughly 22 to 50 units a week for men and 15 to 35 for women [4].
• Harmful drinking. A pattern already causing damage, physical, such as hepatitis, or mental, such as depression secondary to heavy drinking [4].
• Alcohol dependence. A cluster of behavioural, cognitive and physiological features: a strong desire to drink, difficulty controlling it, and continuing despite harm [4]. It is graded mild, moderate or severe by questionnaire score, which decides whether assisted withdrawal is needed [4].

NHS pages use alcohol use disorder as the umbrella term, while CG115 separates harmful drinking from dependence [1][3].

Causes and risk factors

There is no single cause. Alcohol use disorder develops from how much and how often someone drinks, physical adaptation to alcohol, mental health and social circumstances together [4].

Recognised risk factors include:

• Regularly drinking above the UK low risk guideline of 14 units a week, or at hazardous levels over time [4][5].
• Existing depression or anxiety [4].
• Other substance use, including drug misuse and nicotine dependence [4].
• A social network where heavy drinking is usual, or being affected by a parent’s drinking [4][6].

The evidence does not support the idea that difficulty stopping is weak willpower: difficulty cutting down despite wanting to is one of the defining signs [1].

How it is diagnosed

In the UK, alcohol use disorder is assessed by a GP or a specialist alcohol service [2]. Assessment usually involves questions about how much a person drinks and how it affects their life, a questionnaire, and sometimes blood tests [2]. Two questionnaires appear in NICE’s evidence:

• AUDIT, a screening questionnaire. A score of 16 or more indicates possible dependence [4].
• SADQ, which grades severity: about 15 or below is mild, about 15 to 30 moderate, and 31 or above severe [4].

Alcohol Change UK runs a free online drinking health check quiz [7]. It is a self-check, not a diagnosis.

A GP is the usual first contact and can refer on [8]. Local alcohol services exist across the UK, and providers can be found directly through a local authority website or NHS service directories [8]. No reliable national waiting time figure appears in these sources.

A diagnosis describes a pattern of drinking and its effects, not a person’s character [4].

Treatment

CG115 covers harmful drinking and alcohol dependence in adults and young people aged 10 to 17 [3]. Treatment is matched to severity.

Hazardous and harmful drinking. Brief intervention from a non-specialist, usually in primary care, is effective and good value at this stage [4]. It is less effective once someone is dependent, when specialist referral is needed [4].

Assisted withdrawal. Mild dependence usually does not need it [4]. Moderate dependence usually does, often managed in the community unless there are other risks [4]. Severe dependence typically needs an inpatient or residential setting [4]. It is medically supervised and is not something to attempt alone.

Psychological interventions after withdrawal. NICE’s evidence names motivational enhancement therapy, cognitive behavioural therapy, group and family based therapies, social behaviour and network therapy, 12-step facilitation, and community-based or residential rehabilitation programmes [4].

Relapse prevention medication. Three medicines are used: acamprosate and naltrexone, which reduce cravings, and disulfiram, which causes unpleasant effects if alcohol is drunk [2][4]. They are prescribed alongside psychological support, not instead of it [4]. Suitability and dosing are decisions for a prescriber.

CG115 dates from 2011, with a review decision in 2015 [3]. It sets no fixed daily unit thresholds for choosing between community and inpatient withdrawal, relying on severity scoring instead [4].

Living with alcohol use disorder

If you are physically dependent, you should not stop drinking suddenly on your own [1][2]. Speak to a GP or a local alcohol service so any withdrawal is managed safely.

Day to day, UK guidance supports these:

• Track what you actually drink. The NHS Drink Free Days app is built for this [2].
• If you are cutting down rather than stopping, stay under 14 units a week, spread over three or more days [5].
• Expect mood to be part of it. Depression and anxiety alongside heavy drinking usually settle within a few weeks of stopping, without separate psychiatric treatment [4]. If they persist beyond withdrawal, tell your team, as that more often needs treatment in its own right [4].
• Mutual aid is free and runs across the UK: Alcoholics Anonymous and SMART Recovery [2][6].
• Family and friends have their own routes: Al-Anon, Alateen, Adfam and Nacoa on 0800 358 3456 [2][6].

When to speak to a professional

Contact a GP or a local alcohol service if:

• You regularly drink more than you meant to, or find it hard to cut down [1].
• You need a drink in the morning, or more than you used to for the same effect [1].
• Drinking is affecting your health, work or relationships, or people close to you have raised concerns [1].
• You feel low or anxious and are drinking to manage it [4].

Get medical help before you try to stop if you get withdrawal symptoms when you cut down [2]. Seek urgent care through NHS 111 or 999 if withdrawal brings severe shaking, confusion, hallucinations or a seizure [1][6].

If you are struggling to cope or thinking about ending your life, call Samaritans free on 116 123, or text SHOUT to 85258 [9][10]. Call 999 if anyone is in immediate danger.

Common questions

Is it dangerous to stop drinking alcohol suddenly?

It can be, for anyone who is physically dependent. The NHS states it can be very dangerous to stop suddenly when a person is dependent, and that medical help should come first if withdrawal symptoms are present [1][2]. Alcohol Change UK states that clinically dependent people can die if they stop completely and abruptly [8]. Withdrawal is planned with a doctor or an alcohol service.

Do I have to be dependent before I can get help?

No. Brief advice from a GP or another non-specialist is effective for hazardous and harmful drinking, the stages before dependence [4]. Earlier is when the simplest interventions work best.

Will my depression or anxiety improve if I stop drinking?

Often. NICE’s evidence notes that psychiatric symptoms in people seeking help for alcohol problems usually resolve within a few weeks of stopping, without formal psychiatric treatment [4]. Where the mental health condition came first, it may still need treatment after withdrawal [4].

Clinical review pending

References

1. NHS. Alcohol-use disorder. nhs.uk, accessed 2026. https://www.nhs.uk/conditions/alcohol-misuse/
2. NHS. Alcohol-use disorder: treatment. nhs.uk, accessed 2026. https://www.nhs.uk/conditions/alcohol-misuse/treatment/
3. National Institute for Health and Care Excellence. Alcohol-use disorders: diagnosis, assessment and management of harmful drinking and alcohol dependence. Clinical guideline CG115. https://www.nice.org.uk/guidance/cg115
4. National Collaborating Centre for Mental Health. Alcohol-Use Disorders: Diagnosis, Assessment and Management of Harmful Drinking and Alcohol Dependence. British Psychological Society, 2011. https://www.ncbi.nlm.nih.gov/books/NBK65500/
5. NHS. Alcohol units. nhs.uk, accessed 2026. https://www.nhs.uk/live-well/alcohol-advice/calculating-alcohol-units/
6. NHS. Alcohol support. nhs.uk, accessed 2026. https://www.nhs.uk/live-well/alcohol-advice/alcohol-support/
7. Alcohol Change UK. Check your drinking. Accessed 2026. https://alcoholchange.org.uk/alcohol-facts/interactive-tools/check-your-drinking
8. Alcohol Change UK. Worried about your drinking? Get help. Accessed 2026. https://alcoholchange.org.uk/help-and-support/get-help-now
9. Samaritans. Contact Us. Accessed 2026. https://www.samaritans.org/how-we-can-help/contact-samaritan/
10. Shout. Shout: the UK’s free, confidential, 24/7 mental health text service. Accessed 2026. https://giveusashout.org/