Alcohol and Health

Why does alcohol matter for health?

For most of the last half-century, public understanding of alcohol has been shaped by a now-weakened idea: that a little is good for you. More recent, larger, and better-designed studies have steadily eroded that picture. In 2023, the Office for National Statistics recorded 10,473 alcohol-specific deaths in the UK¹⁰ — the highest number since records began, and 38% higher than in 2019.¹⁰ About three-quarters of those deaths were from alcohol-related liver disease.¹⁰ None of these figures include the much larger total of alcohol-related deaths — cancers, heart disease, strokes, and injuries where alcohol was one contributing factor.

Alcohol affects many body systems simultaneously. The five headline reasons it matters:

• 1
  It causes at least seven cancers

  Alcohol is an established cause of cancers of the mouth, throat (pharynx and larynx), oesophagus (food pipe), liver, bowel (colorectum), and female breast.⁸ In the UK, alcohol is responsible for around 3.3% of all new cancer cases each year — approximately 11,900 cases — including roughly 1 in 10 cases of female breast cancer (about 4,400 women per year).¹¹ For context, tobacco accounts for around 15% of UK cancer cases and overweight/obesity for 6% — alcohol is a major contributor, but not the largest.¹¹
• 2
  It raises cardiovascular risk across the board

  Alcohol raises blood pressure, triggers atrial fibrillation (an abnormal heart rhythm — increasingly recognised even at modest intake), and increases risk of haemorrhagic stroke (bleeding into the brain) and heart failure.⁴ Genetic studies now show the rise in risk is monotonic — meaning risk goes up with every unit, not down at low doses.⁴
• 3
  It damages the liver in predictable stages

  Alcohol-related liver disease moves through three recognised stages — fatty liver (steatosis), inflammation (alcoholic hepatitis), and scarring (cirrhosis).¹² Fatty liver develops in almost all heavy drinkers and is reversible. Around 20–30% of those who keep drinking heavily progress to alcoholic hepatitis. Roughly 10% (up to 1 in 5) develop cirrhosis, which is permanent.¹²
• 4
  It shrinks the brain — at lower levels than many realise

  Imaging studies of tens of thousands of UK adults show smaller grey matter and reduced white-matter integrity — the brain's wiring — detectable even at 1–2 units a day.⁶ Heavy, chronic drinking causes cognitive decline and increases dementia risk;⁷ it is also one of the Lancet Commission's 14 modifiable risk factors for dementia.¹³
• 5
  It worsens mental health and sleep

  Alcohol is often used to manage anxiety, low mood, or poor sleep — yet it consistently worsens all three.⁹ It fragments sleep architecture (reduces deep and REM sleep), flattens mood in the days after drinking, reduces the effectiveness of antidepressant medication, and is strongly linked to suicide risk at higher intakes.⁹

What your doctor might do

In UK practice, GPs approach alcohol through screening, conversation, investigation, and — where relevant — a structured treatment pathway set out in NICE guideline CG115. None of it assumes that someone must stop drinking completely; the aim is an informed conversation about risk and about change.

None of this is a single-visit process. In UK practice, the typical pattern is a conversation, blood tests, a follow-up review of those results, and an agreed plan — whether that plan is "cut down over three months", "I want to stop and need help with withdrawal", or "I want to think about it". For anything that feels personally relevant, this is a conversation for you to have with your GP or healthcare professional.

What the research shows

The evidence on alcohol has shifted substantially in the last decade. The older story — moderate drinking may be good for the heart — came from observational studies where "non-drinkers" often included people who had stopped drinking because of existing illness (the "sick quitter" problem). Newer studies using genetic methods, and meta-analyses that exclude this bias, tell a different story. Six key studies:

How alcohol actually causes harm

Putting it all together