U.S. Surgeon General Highlights Cancer Risks of Alcohol, Calls for Warning Labels

Earlier this year, the U.S. Surgeon General released a report warning that alcohol consumption increases the risk of at least seven types of cancer and called for cancer warning labels on alcoholic beverages. While the link between alcohol and cancer is not new—scientists classified alcohol as a carcinogen over 35 years ago—evidence continues to accumulate.

The carcinogenic mechanism of alcohol has been extensively studied. Ethanol, the active ingredient in alcoholic drinks, is metabolized in the body into acetaldehyde, a compound that damages DNA and contributes to cancer development. Research by the International Agency for Research on Cancer (IARC) has shown strong associations between alcohol consumption and cancers of the mouth, throat, esophagus, breast, colon, rectum, and liver. Notably, even low levels of alcohol—such as half a drink per day (approximately 5 grams of ethanol)—can slightly raise the risk of breast cancer.

While the harmful effects of heavy drinking are well established, the risks associated with low or moderate alcohol consumption remain a subject of debate. Some studies suggest moderate drinking may offer cardiovascular benefits; however, most researchers believe these potential benefits are outweighed by the increased risks of cancer and other health conditions. Both the World Cancer Research Fund (WCRF) and the World Health Organization (WHO) emphasize that there is no "safe" level of alcohol consumption—any amount of alcohol can raise the risk of cancer.

Research also indicates that drinking patterns, such as binge drinking, and factors like age influence cancer risk. As people age, their ability to metabolize alcohol declines, potentially increasing its carcinogenic effects. Globally, alcohol is the third leading preventable cause of cancer, following tobacco use and obesity.