Years of heavy drinking can quietly weaken the heart muscle until it can no longer pump properly — a condition called alcoholic cardiomyopathy, a form of alcohol-induced heart failure. The encouraging part is that, caught in time, it is one of the few types of heart failure that can substantially improve, and sometimes nearly reverse, when a person stops drinking. This page explains what it is, the warning signs, and a real patient of mine whose heart recovered.
What Is Alcoholic Cardiomyopathy?
Alcoholic cardiomyopathy (ACM), also called alcohol-induced cardiomyopathy, is a form of dilated cardiomyopathy — the heart muscle becomes weakened and stretched, especially the left ventricle, the main pumping chamber. As it enlarges and thins, it squeezes less effectively, so less blood is pumped with each beat. Over time this leads to heart failure: breathlessness, fatigue and fluid build-up.
In simple terms, years of heavy alcohol exposure can gradually injure the heart muscle. Crucially, it is a diagnosis of exclusion — we make it only after checking that the weak heart isn’t due to blocked coronary arteries, a primary valve problem, or a long-standing fast rhythm, all of which can look similar on a scan.
Unlike many causes of heart failure, alcoholic cardiomyopathy often has a reversible component: in people who stop drinking early enough, heart function can recover substantially.
A Real Case — Alcohol-Induced Heart Failure
A 56-year-old carpenter with a failing heart
Forty years of heavy drinking — and a heart that came back.
He came to see me with severe breathlessness on exertion and orthopnoea — breathlessness when lying flat. It had become so bad that he could no longer do his job, which is what finally brought him in, despite a lifelong aversion to doctors.
The history told the story. He had been drinking around 60 beers a week for four decades — roughly eight to nine standard drinks a day, every day, for most of his adult life.
Put another way: across forty years that is very roughly 41,000 litres of beer and well over a tonne of pure alcohol.
With normal coronary arteries, sinus rhythm, no primary valve disease and a long history of heavy alcohol exposure, alcoholic cardiomyopathy was the most likely diagnosis. Faced with it, he made the decision to stop drinking completely. After one year of total abstinence, together with standard heart-failure medication, his left ventricular function had recovered markedly and the mitral regurgitation had nearly resolved — the recovery you can see in the second loop above.
It is a striking reminder of how much damage alcohol can do over time — and of how resilient the heart can be when it’s given the chance to heal.
Symptoms of Alcoholic Cardiomyopathy
The symptoms are those of heart failure and often come on gradually, so they’re easy to dismiss as ageing or being unfit. Common features include:
- Breathlessness — first on exertion, later when lying flat or at night
- Fatigue and reduced exercise tolerance
- Swelling of the legs, ankles or feet
- Palpitations or an irregular heartbeat
- A cough or wheeze that’s worse lying down
Breathlessness that is new, worsening, or wakes you at night should be assessed promptly — particularly alongside a heavy drinking history. A GP can arrange the first tests, including an echocardiogram.
How Much Alcohol Can Cause Cardiomyopathy?
There is no exact tipping point, and individual susceptibility varies, but the condition is usually linked to sustained heavy intake — broadly more than about 80 grams of alcohol a day (around eight Australian standard drinks) for at least five years, and often much longer.
Equally important is what we rule out before settling on the diagnosis. ACM is made when the weak heart is not explained by blocked coronary arteries (ischaemic heart disease), a primary heart-valve problem, or a long-standing fast or abnormal rhythm such as poorly controlled atrial fibrillation.
Alcohol can also trigger atrial fibrillation and other rhythm problems, which may worsen heart failure or mimic cardiomyopathy if the heart has been racing for long periods.
In my patient, an intake of eight to nine standard drinks a day for forty years sat well above that threshold — and with normal coronaries and sinus rhythm, the picture fit.
Why Alcohol Damages the Heart Muscle
The mechanisms aren’t fully settled, but several act together:
- Direct toxicity. Alcohol and its main breakdown product, acetaldehyde, are toxic to heart muscle cells — interfering with the contracting proteins and damaging the cells’ energy machinery (the mitochondria).
- Nutritional and related factors. Heavy drinkers often have deficiencies (such as thiamine) and other alcohol-related problems that add to the strain.
- A genetic “second hit.” Not everyone who drinks heavily develops cardiomyopathy, and part of the reason appears to be genetic. Recent work shows that many people with alcohol-induced cardiomyopathy also carry inherited gene variants linked to dilated cardiomyopathy — most often in a large heart-muscle protein called titin. Carriers of these “titin-truncating” variants tend to have meaningfully weaker hearts for the same drinking. The current view is a “double-hit”: heavy alcohol on top of a genetic predisposition.
This helps explain why two heavy drinkers can fare so differently — and why a family history of unexplained heart failure or cardiomyopathy matters.
Alcohol also rarely acts alone: it commonly travels with high blood pressure, smoking and atrial fibrillation, each of which compounds the damage.
How Is Alcoholic Cardiomyopathy Diagnosed?
There is no single test for alcoholic cardiomyopathy. The diagnosis comes from putting together a careful history with tests that confirm a weakened heart and, just as importantly, rule out other causes. The usual workup includes:
- A careful alcohol history, ideally counted in standard drinks.
- An ECG, to look at the heart’s rhythm and electrical pattern.
- Blood tests — including kidney and liver function, thyroid function, and iron studies where appropriate.
- An echocardiogram — the key test, showing how well the heart muscle is pumping and whether the chambers are enlarged.
- Assessment of the coronary arteries when clinically indicated, to exclude blocked arteries as the cause.
- Rhythm assessment if a sustained fast or abnormal rhythm is suspected.
Cardiac MRI is sometimes useful when the diagnosis is uncertain — particularly to look for scar, myocarditis, or an alternative form of cardiomyopathy. It is not needed in every case.
Can Alcoholic Cardiomyopathy Be Reversed?
This is the most important — and most hopeful — part. Unlike heart failure from a large heart attack, alcoholic cardiomyopathy often has a genuinely reversible component.
The single most powerful treatment is stopping alcohol. In people who become abstinent, left ventricular function frequently improves, and those whose pumping function recovers have an excellent long-term outlook — considerably better than many other forms of dilated cardiomyopathy. Some evidence suggests that even cutting down substantially helps, but complete abstinence gives the best and most reliable recovery, and is what I recommend.
My patient’s heart is the proof: a year of not drinking, plus heart-failure medication, took him from a severely weakened heart to a marked recovery of pumping function.
Recovery isn’t guaranteed, and it’s more likely the earlier the condition is caught — before the muscle is irreversibly scarred. That’s why acting on early symptoms matters.
Treatment for Alcoholic Cardiomyopathy
Treatment has two arms that work together:
- Complete abstinence from alcohol — the foundation, and the factor that most determines whether the heart recovers.
- Standard heart-failure therapy — usually several heart-failure medicines working together to support the heart while it recovers, along with regular review and repeat echocardiograms to track progress.
Beyond abstinence, alcoholic cardiomyopathy is managed as HFrEF per current guidelines — the four pillars (an ARNI, or ACE inhibitor/ARB; a beta-blocker; a mineralocorticoid receptor antagonist; and an SGLT2 inhibitor), titrated to blood pressure, renal function and tolerance.
Stopping is easier said than done, and support makes a real difference — through your GP, addiction specialists, and support services.
If you drink heavily every day, don’t stop abruptly on your own. Sudden alcohol withdrawal can be dangerous and sometimes needs medical supervision. Speak to your GP about the safest way to stop.
- Your GP — the first step for assessment and a safe withdrawal plan.
- National Alcohol and Other Drug Hotline: 1800 250 015 (free, 24/7)
- Alcohol and Drug Foundation: 1300 858 584
- Alcoholic cardiomyopathy is heart failure caused by years of heavy drinking weakening the heart muscle.
- It’s usually linked to sustained heavy intake — broadly eight or more standard drinks a day over years — and is diagnosed after excluding other causes.
- Genetics matter: an inherited predisposition (often in the titin gene) can make some drinkers far more vulnerable.
- It is often reversible — stopping alcohol is the single most powerful treatment, and recovery of pumping function carries an excellent outlook.
- New or worsening breathlessness with a heavy drinking history should be assessed promptly.
Frequently Asked Questions
Is alcoholic cardiomyopathy reversible?
Often, at least partly. In people who stop drinking, heart-pumping function frequently improves, and those whose function recovers have an excellent long-term outlook. Recovery is more likely the earlier it’s caught.
How much drinking causes alcoholic cardiomyopathy?
There’s no exact threshold, but it’s usually linked to heavy intake over years — broadly more than about eight Australian standard drinks a day for at least five years, often longer. Susceptibility varies from person to person.
What are the first signs of alcohol damaging the heart?
Often breathlessness on exertion, tiredness, reduced exercise tolerance, and swelling of the legs or ankles. Breathlessness when lying flat or at night is a particularly important warning sign.
Can the heart recover if I just cut down rather than stop?
Cutting down substantially may help, but complete abstinence gives the best and most reliable recovery, and is what cardiologists recommend once the diagnosis is made.
How is it diagnosed?
With an echocardiogram to assess the heart muscle, plus tests to exclude other causes such as blocked arteries, valve disease or a sustained abnormal rhythm. A detailed alcohol history is central. See how it’s diagnosed above.
References & Further Reading
Clinical references
- Mirijello A, et al. Alcoholic cardiomyopathy: an update. Eur Heart J. 2024;45(26):2294–2305.
- Amor-Salamanca A, Guzzo-Merello G, et al. Prognostic impact and predictors of ejection fraction recovery in patients with alcoholic cardiomyopathy. Rev Esp Cardiol (Engl Ed). 2018;71(8):612–619.
- Piano MR. Alcohol’s effects on the cardiovascular system. Alcohol Res. 2017;38(2):219–241.
- Arbelo E, et al. 2023 ESC Guidelines for the management of cardiomyopathies. Eur Heart J. 2023;44(37):3503–3626.
- Guzzo-Merello G, et al. Alcoholic cardiomyopathy. World J Cardiol. 2014;6(8):771–781.
Further reading for patients
- Heartcare Sydney — Alcohol and heart health.
- Heart Foundation (Australia) — Heart failure.
For the bigger picture on drinking and your heart, see our guide to alcohol and heart health.
Worried about your heart and alcohol?
Dr Reza Moazzeni is a consultant cardiologist in Westmead and St Leonards. If you’ve been drinking heavily and have breathlessness, swelling or fatigue, an assessment — including an echocardiogram — can tell you whether your heart has been affected. A GP referral is required.
Book an appointment