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This describes what alcohol does in the body and how health agencies classify it. It does not tell anyone how much to drink, or whether to. Official guidance on amounts is being revised in several countries, so any number here would age badly. If you are worried about your own drinking, a doctor is a better place to take that than a page.
Follow a single drink through. It is a short journey and most of it happens in one organ.
Alcohol is a small molecule. It crosses straight from the stomach and small intestine into the blood, without being broken down first.
That is why it works quickly, and why food slows it down.
It dissolves in water, and you are mostly water. Within minutes it is in every tissue you have, brain included.
There is nowhere it does not go.
Almost all of it is handled by the liver, in two steps, at a rate you cannot hurry.
Coffee, cold air and a walk do nothing to the speed.
The first thing your body turns alcohol into is:
A second enzyme turns acetaldehyde into acetate, which is harmless and gets used or breathed out.
How fast that second step runs varies a lot between people.
Many people, particularly of East Asian descent, carry a slower version of the second enzyme.
Acetaldehyde builds up. The face goes red. That reaction is the visible version of what everyone is producing.
The World Health Organization's cancer agency sorts substances by how good the evidence of cause is. Group 1 is the top: causes cancer in humans.
Which group are alcoholic drinks in?
It means the evidence that it causes cancer is settled. It does not mean one drink equals one cigarette.
The category is about how sure we are, not how much harm.
The evidence is judged sufficient for cancers of the mouth, throat, voice box, oesophagus, liver, bowel, and female breast.
Those are named, not a general warning.
Breast cancer is on that list, and it is the least known of the seven.
It is also the one where the association shows up at low amounts.
The agency states the link holds even at low and moderate intake.
That is the finding that changed what health bodies have started saying.
In January 2025 the US Surgeon General issued an advisory calling for cancer warning labels on alcohol, naming those same seven.
It described alcohol as the third leading preventable cause of cancer, after smoking and obesity.
Alcohol is ordinary. It is at weddings and funerals and dinner. The classification has been in place for over a decade and mostly stayed inside public health.
The gap is in what got said out loud, not in the evidence.
Not an instruction. Not a number of drinks. Not a judgement about anyone's evening.
Just what happens inside, and what the agencies have concluded.