Many studies show that drinking alcohol increases the risk of breast cancer.
A pooled analysis of data from 53 studies found for each alcoholic drink consumed per day, the relative risk of breast cancer increased by about seven percent . Women who had two to three alcoholic drinks per day had a 20 percent higher risk of breast cancer .
Alcohol may increase breast cancer risk in several ways.
Alcohol can change the way a woman's body metabolizes estrogen (how estrogen works in the body). This can cause blood estrogen levels to rise.
Estrogen levels are higher in women who drink alcohol than in non-drinkers . These higher estrogen levels may in turn, increase the risk of breast cancer .
Learn more about estrogen and breast cancer risk.
For a summary of research studies on alcohol and breast cancer, visit the Breast Cancer Research Studies section.
Drinking alcohol can reduce blood levels of the vitamin folic acid. Folic acid plays a role in copying and repairing DNA. Low levels of folic acid may make it more likely that DNA is incorrectly copied when cells divide. Such errors can lead cells down a pathway to become cancer.
No one should drink a lot of alcohol. For those who drink some alcohol, some findings suggest that getting enough folic acid (often called folate on nutrition labels) may help reduce the extra breast cancer risk linked to drinking alcohol [21-23]. However, not all studies show that folic acid reduces this extra risk [24-26]. This is an area of active research.
Folic acid is part of a healthy diet. You can get folic acid through a multivitamin or foods such as oranges, green leafy vegetables and fortified breakfast cereals.
No one should drink a lot of alcohol. Drinking more than one drink per day (for women) and more than two drinks per day (for men) has no health benefits and many serious health risks, including breast cancer.
Drinking low to moderate amounts of alcohol, however, may lower the risks of heart disease, high blood pressure and death [27-28].
After talking with your health care provider, make informed choices about drinking low to moderate amounts of alcohol.
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Some findings suggest that breast cancer survivors who drink alcohol after diagnosis have an increased risk of recurrence . However, other studies have shown no difference in recurrence between survivors who drink alcohol in moderation (less than one drink a day for women) and survivors who are non-drinkers [30-31].
Findings from studies on alcohol and breast cancer survival are also mixed. Some studies have found that breast cancer survivors who drink alcohol have an increased risk of death, while others have not [29-33].
One reason for these mixed findings may be that drinking in moderation has some health benefits. It may lower the risks of heart disease, high blood pressure and overall death [27-28].
Excessive alcohol drinking has no health benefits, only health risks.
For a summary of research studies on alcohol and breast cancer survival, visit the Breast Cancer Research Studies section.
Susan G. Komen’s breast self-awareness messages
1. Know your risk
2. Get screened
3. Know what is normal for you and see a health care provider if you notice any of these breast changes (see images):
4. Make healthy lifestyle choices