Women who drink above the government's recommended limit are 50% more likely to develop breast cancer, the Department of Health has said.
A £10m advertising campaign has been launched targeting middle-aged women who might underestimate their drinking. A health department report, which has yet to be published, says women who drink more than 14 units of alcohol a week are at increased risk.
Cancer Research says alcohol causes about 2,000 breast cancer cases a year.
Public Health Minister Dawn Primarolo said: "Women who regularly drink too much are 50% more likely to develop breast cancer. And many drink too much simply because they have no idea how many alcohol units they are consuming.
"After the campaign no-one will be in any doubt as to how many units they're drinking and the impact that can have on their health."
Source - BBC