This article has been medically reviewed by Fengting Yan, MD, PhD, FACP
Most people know that tobacco causes cancer, but far fewer know that alcohol does, too. In the United States alone, alcohol contributes to nearly 100,000 new cancer diagnoses and approximately 20,000 cancer deaths every year. [1] Yet according to two studies in JAMA Oncology, more than half of American adults are unaware or uncertain about the link between drinking and cancer. In the U.S., alcohol-associated cancer deaths doubled from 11,896 in 1990 to 23,207 in 2021, with proportional alcohol-associated mortality increasing across nearly all cancer types and demographic groups. [2,3]
This article explains how alcohol interacts with cancer biology, which cancers are most affected, and how much risk each additional drink actually adds.
What Is Alcohol?
In the health context, “alcohol” refers specifically to ethanol, the compound produced when sugars and starches ferment. It is found in every type of alcoholic beverage. In the US, a standard drink contains 14 grams of pure ethanol, equivalent to 12 oz of regular beer, 5 oz of wine, or 1.5 oz of 80-proof spirits. [4] Many people underestimate how much they actually drink: a large restaurant pour of wine may equal two standard drinks, and a craft beer two or three.
The Science Is Clear: Alcohol Causes Cancer
The link between cancer and alcohol is causal. The International Agency for Research on Cancer (IARC) classified alcoholic beverages as a Group 1 carcinogen in 1988 [5] — the same classification given to tobacco, asbestos, and ionizing radiation. (Group 1 means the evidence of causation is definitive, not that the risk level is equivalent to tobacco or asbestos.) The U.S. National Toxicology Program has listed alcoholic beverages as a known human carcinogen since 2000. [1] Globally, an estimated 741,300 new cancer cases in 2020 (or 4.1% of all new cancers worldwide) were attributable to alcohol. [1] In the United States, alcohol accounts for roughly 5% of all cancer cases and approximately 4% of cancer deaths.
Why Does Alcohol Raise the Risk of Cancer?
Researchers have identified multiple pathways through which alcohol damages cells. All apply equally to beer, wine, and spirits, since the active carcinogenic compound, ethanol, is present in every alcoholic drink.
Acetaldehyde: The Primary Carcinogen
When the body metabolizes ethanol, the liver converts it into acetaldehyde, a toxic chemical that directly damages DNA and proteins. Acetaldehyde forms DNA adducts that interfere with normal cell replication and can trigger malignant transformation — in other words, it chemically attaches itself to DNA, causing the cell to make mistakes when it copies its genetic code, some of which can set off cancer. Crucially, acetaldehyde is also produced locally in the mouth by oral bacteria, meaning regular drinkers expose oral tissues to carcinogens at the cellular level as well as systemically. [1]
Oxidative Stress
Alcohol metabolism generates reactive oxygen species: chemically unstable molecules that damage DNA, proteins, and lipids through oxidation. This oxidative stress weakens cells’ ability to repair themselves, creating conditions favorable to tumor development.
Hormonal Disruption
Alcohol raises circulating blood levels of estrogen. Elevated estrogen is a well-established driver of hormone receptor-positive (specifically estrogen receptor-positive) breast cancer, the most common form of the disease. Even light alcohol consumption raises breast cancer risk in women. [1]
The Solvent Effect
Alcohol makes the mucous membranes of the mouth, throat, and esophagus more permeable, allowing other carcinogens to penetrate cells more easily. This is why the combination of alcohol and tobacco and cancer risk is far more dangerous than either alone: alcohol amplifies tobacco’s carcinogenic reach.
Nutrient Impairment
Alcohol impairs the absorption of folate, vitamins A, C, D, and E — nutrients that protect against abnormal cell growth. Folate depletion in particular increases the likelihood of DNA methylation errors (disruptions to the signals that control how genes are expressed) that can initiate cancer.
What 7 Cancers Are Linked to Alcohol?
Evidence firmly establishes alcohol as a cause of seven cancer types: breast (in women), colorectum, esophagus, liver, mouth (oral cavity), throat (pharynx), and voice box (larynx). [1] The figures below come from a major 2015 meta-analysis of over 570 studies, which measured relative risk (RR) — how much more likely drinkers are to develop a given cancer compared to non-drinkers — at light, moderate, and heavy consumption levels. [6]
| Cancer Type | Light Drinking | Moderate Drinking | Heavy Drinking | Source |
| Breast (women) | 1.04x | 1.23x | 1.61x | Bagnardi 2015 [6] |
| Colorectum | No significant association | 1.17x | 1.44x | Bagnardi 2015 [6] |
| Esophagus (squamous cell carcinoma)* | 1.26x | 2.23x | 4.95x | Bagnardi 2015 [6] |
| Liver | No significant association | No significant association | 2.07x | Bagnardi 2015 [6] |
| Mouth and throat (oral cavity and pharynx) | 1.13x | 1.83x | 5.13x | Bagnardi 2015 [6] |
| Voice box (larynx) | No significant association | 1.44x | 2.65x | Bagnardi 2015 [6] |
*Esophageal cancer has two major subtypes. The figures above reflect squamous cell carcinoma, where alcohol’s effect is strong and consistent across drinking levels. Adenocarcinoma, often linked to acid reflux rather than alcohol, showed no significant association with alcohol consumption at any level in the same analysis.
Note: Relative risks compare cancer likelihood in drinkers versus non-drinkers. For less common cancers, a high relative risk may still represent a small absolute change in individual lifetime odds. For common cancers like breast, even a modest relative risk has large population-level consequences.
Two additional pooled analyses offer separate, complementary figures worth noting. A pooled analysis of 20 cohort studies found that women who drink up to about one drink per day have a 10% higher relative risk of estrogen receptor-positive breast cancer (rising to 32% higher for those who drink more than two drinks per day) compared to women who don’t drink. [7] Another, drawing on 26 case-control studies of head and neck cancer, found that people drinking about one drink per day had 40% higher relative odds of these cancers, rising to 97% higher at about two drinks per day. [8] These figures come from different research teams using different methods than the meta-analysis above, so the exact numbers vary, but the direction and overall pattern — risk rising with consumption, even at low levels for breast cancer specifically — is consistent across all of them.
Some evidence also suggests possible links between alcohol and cancers of the skin (melanoma), stomach, pancreas, gallbladder, and prostate. The strength of that evidence varies by site. Prostate, kidney, and thyroid cancer each have their own dedicated meta-analyses examining their relationship to alcohol; stomach, pancreas, and gallbladder cancer currently rest on more limited evidence, drawn mainly from a single large multi-cancer analysis rather than site-specific research. [6,9] Despite these differences, a 2015 meta-analysis found statistically significant associations between heavy drinking and several of these sites, including a notably large effect for gallbladder cancer. [6] The 2025 Surgeon General’s Advisory characterizes the evidence at all of these sites as still requiring further research before a causal relationship can be established, unlike the seven cancers listed above. [1]
Alcohol consumption has also been associated with reduced risk of kidney cancer in some research, though the Surgeon General’s Advisory notes this finding needs further study before any protective effect can be considered established. [1] Separately, a large 2015 meta-analysis found statistically significant reduced risk of thyroid cancer and both Hodgkin and non-Hodgkin lymphoma among drinkers compared to non-drinkers. [6] For these protective associations, researchers caution that the number of cancers potentially avoided is far smaller than the number of cancers alcohol causes overall.
In the United States, breast cancer is the most common alcohol-related cancer among women, while colorectal cancer awareness efforts emphasize that colorectal cancer is the most common alcohol-linked cancer in men. This is consistent with findings that the colorectal cancer link is stronger in men than in women. [6] Approximately 86% of new alcohol-associated cancer cases occur in people aged 50 or older. [1]
Who Faces the Highest Risk?
Cancer risk from alcohol is not uniform. Several factors significantly amplify individual susceptibility.
Genetics: ALDH2 and ADH Variants
Two key enzymes govern how the body processes alcohol: alcohol dehydrogenase (ADH), which converts ethanol to acetaldehyde, and aldehyde dehydrogenase 2 (ALDH2), which then neutralizes the acetaldehyde. A poorly-functioning ALDH2 variant — far more common in people of East Asian descent than in other populations — causes acetaldehyde to accumulate in the body when someone drinks, substantially raising their risk of esophageal and head and neck cancers even at moderate consumption. [1]
Alcohol Combined with Tobacco
The risk of oral, pharyngeal, laryngeal, and esophageal cancers among people who both drink and smoke is multiplicative, not additive. For oral and pharyngeal cancers, heavy drinking and heavy smoking together can increase risk by 30-fold or more. [1]
Sex Differences and Family History
Women are more susceptible to alcohol-related breast cancer due to estrogen pathways, and tend to reach higher blood alcohol concentrations than men after drinking equivalent amounts, due to differences in average body composition. [7,1] For individuals with strong family histories of alcohol-related cancers, even light drinking may carry a clinically meaningful additional risk worth discussing with a healthcare provider.
How Much Risk Does Drinking Add?
The 2025 Surgeon General’s Advisory makes the absolute risk concrete. Using population data from 226,162 individuals: [1]
| Drinking Level | Definition | Alcohol-Related Cancer per 100 People | Source |
| < 1 drink/week — Women | Baseline | 17 out of 100 | Surgeon General Advisory, Jan 2025 [1] |
| 1 drink/day — Women | Light-Moderate | 19 out of 100 (+2 vs. baseline) | Surgeon General Advisory, Jan 2025 [1] |
| 2 drinks/day — Women | Moderate-Heavy | 22 out of 100 (+5 vs. baseline) | Surgeon General Advisory, Jan 2025 [1] |
| < 1 drink/week — Men | Baseline | 10 out of 100 | Surgeon General Advisory, Jan 2025 [1] |
| 1 drink/day — Men | Light-Moderate | 11 out of 100 (+1 vs. baseline) | Surgeon General Advisory, Jan 2025 [1] |
| 2 drinks/day — Men | Moderate-Heavy | 13 out of 100 (+3 vs. baseline) | Surgeon General Advisory, Jan 2025 [1] |
Australian cohort data, recalculated using U.S. standard drinks. Source: U.S. Surgeon General’s Advisory, January 2025 [1].
For breast cancer specifically, women who drink one drink per day have a lifetime breast cancer risk of approximately 13.1%, compared to 11.3% for those who drink less than one per week. At two drinks per day, lifetime risk rises to 15.3%. Compared to those who have less than one drink a week, this entails an additional four women per 100 developing breast cancer. [1]
Is Light Drinking Safe?
A 2023 systematic review and meta-analysis of 139 cohort studies found that while overall all-cause cancer risk did not significantly increase with light drinking, light alcohol consumption was significantly associated with higher risks of esophageal, colorectal, and breast cancers specifically. [10] The WHO and IARC position is that no safe level of alcohol consumption can be established for cancer risk. Risks rise proportionally with amount consumed. [5]
From a cancer prevention insights standpoint, less alcohol is consistently better across all population groups studied.
Does It Matter How You Drink, Not Just How Much?
Pattern matters alongside volume. Binge drinking — typically five or more drinks for men, four for women, within about two hours — creates higher peak acetaldehyde levels and intensifies DNA damage. The same number of weekly units consumed in one sitting is more harmful than when spread across the week.
The Awareness Gap and the 2025 Surgeon General’s Advisory
Despite alcohol’s carcinogenic classification since 1988, public awareness has remained strikingly low. A May 2025 study from MD Anderson Cancer Center published in JAMA Oncology found that only 40.6% of American adults knew that alcohol raises cancer risk. [2] A subsequent October 2025 study from the same institution found that 52.9% of adults did not know alcohol affects cancer risk, and that past-month drinkers were 76% more likely than non-drinkers to believe alcohol has no effect on cancer risk. [3]
On January 3, 2025, U.S. Surgeon General Dr. Vivek Murthy issued a formal advisory identifying alcohol as the third leading preventable cause of cancer in the US. [1] The advisory confirmed the causal link to at least seven cancer types, noted that risk begins at or below one drink per day, and called for cancer warning labels on all alcoholic beverages and a revision of US Dietary Guidelines to account for cancer risk at moderate consumption. Notably, roughly 17% of alcohol-related cancer deaths occurred in people drinking at or below current recommended limits.
The alcohol warning label on US beverages, unchanged since 1988, mentions pregnancy risks and impaired driving, but says nothing about cancer. Fewer than half (44.1%) of US adults who saw a clinician in the past year reported any discussion of alcohol’s harms. [11]
Frequently Asked Questions
What cancer is most common with alcoholics?
Breast cancer is the most common alcohol-associated cancer in women, and colorectal cancer is the most common in men. Heavy drinking also sharply raises the risk of liver cancer and head and neck cancers, including cancers of the mouth, throat, and esophagus.
Does it matter what type of alcohol you drink?
No. Beer, wine, and spirits all contain ethanol, and ethanol is the source of carcinogenic risk. A 2025 meta-analysis found no meaningful difference in cancer risk between red wine and white wine. [4] The CDC states plainly: “There is no evidence that drinking red wine reduces the risk of cancer.” If you’re exploring other dietary cancer risk factors, The Cancer News has also covered does sugar feed cancer — a similarly common question with a nuanced evidence-based answer.
What about resveratrol and red wine’s ‘heart health’ benefits?
Resveratrol has shown some anti-tumor activity in laboratory and animal studies, but human studies have found no association between moderate red wine consumption and reduced cancer risk. [1] The amounts of resveratrol in a standard glass of wine are far too low to produce effects seen in controlled lab settings, and any potential benefit is outweighed by the carcinogenic effect of ethanol itself. Mendelian randomization studies, which more reliably estimate causal relationships, have generally found no protective health benefits from moderate alcohol consumption.
Can stopping drinking reduce cancer risk?
Yes. The 2023 IARC Handbooks of Cancer Prevention Working Group concluded that cessation of alcohol consumption reduces the risk of oral, esophageal, laryngeal, pharyngeal, and colorectal cancers, with sufficient evidence that the underlying biological mechanisms are reversible. [12] For laryngeal and pharyngeal cancers, a risk reduction of approximately 15% was observed within 5 years of quitting. It is never too late to reduce or stop drinking — the benefit begins immediately.
Does alcohol kill cancer cells?
No. Alcohol does not kill cancer cells in the human body. It is classified as a known human carcinogen — it increases the risk of developing cancer and can make existing tumors more aggressive. There is no amount of alcohol that has anti-cancer properties in humans.
Is it safe to drink alcohol during or after cancer treatment?
This depends on the specific cancer, treatment protocol, and medications involved. As a general principle, alcohol can interact with chemotherapy drugs, increase treatment side effects, and raise the risk of cancer recurrence. Always ask your oncology team directly.
Practical Steps to Reduce Your Risk
What do oncologists tell cancer patients? Fengting Yan, MD, PhD, FACP, clinical oncologist, weighed in for The Cancer News. "It is best to avoid alcohol entirely, especially for patients undergoing active anti-cancer treatments such as chemotherapy, surgery, and radiation therapy," Yan said. "Alcohol consumption during radiotherapy is associated with worse disease-free survival. Additionally, alcohol can negatively impact postsurgical outcomes, leading to increased complications, longer hospital stays, and higher mortality rates. It may also impair the metabolism of chemotherapeutic agents by affecting hepatic cytochrome enzymes and can exacerbate chemotherapy-related cardiotoxicity and cognitive effects."
For most people, meaningful risk reduction comes from drinking less, not necessarily nothing. For some individuals (those with a strong family history of alcohol-related cancers, or with the ALDH2 variant), abstinence is the more prudent choice. The right approach is one made in conversation with a healthcare provider.
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Track your actual intake. Using a drink diary for one week often reveals patterns that a vague sense of ‘moderate drinking’ conceals.
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Set a concrete goal. ‘No more than X drinks this week’ is more actionable than a vague intention to cut back.
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Have alternatives ready. Sparkling water or alcohol-free drinks reduce the friction of declining in social settings.
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Identify triggers. Replacing reflexive drinking moments with another behavior is more effective than willpower alone.
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Talk to your doctor. Fewer than half of US adults who saw a clinician in the past year reported discussing alcohol’s harms with them — bring it up yourself. [11] Learn about cancer screening facts that may be relevant to your personal risk profile.
The takeaway is not prohibition, but informed choice. That only 37.1% of US adults can correctly identify the causal link between alcohol and cancer suggests most people are not making an informed choice when it comes to alcohol consumption. [3] The Surgeon General’s Advisory — a high-visibility, high-profile codification of what meta-analyses have been proving for decades — is a meaningful step toward greater awareness and collective prevention.
About the Reviewer
Fengting Yan, MD, PhD, FACP, is a Physician and Clinical Associate Professor in the Clinical Research Division at Fred Hutchinson Cancer Center. She completed her fellowship in hematology/oncology at Fred Hutchinson Cancer Research Center and the University of Washington. Dr. Fengting Yan brings a rich background in translational research, women’s health education, and global clinical training. Her work focuses on identifying molecular targets and advancing therapies in women’s cancers.
References
[1] Murthy VH (U.S. Surgeon General). Alcohol and Cancer Risk: The U.S. Surgeon General’s Advisory. Office of the Surgeon General, DHHS. January 3, 2025. https://www.hhs.gov/sites/default/files/oash-alcohol-cancer-risk.pdf
[2] Fokom Domgue J, Yu R, Hawk E, Shete S. Public Awareness of the Association Between Alcohol and Cancer in the US. JAMA Oncology. 2025;11(7):789–791. doi:10.1001/jamaoncol.2025.1146.
[3] Fokom Domgue J, Yu R, Hawk E, Shete S. Beliefs About the Effect of Alcohol Use on Cancer Risk in the US Adult Population. JAMA Oncol. Published online October 30, 2025. doi:10.1001/jamaoncol.2025.4472.
[4] Lim RK, Rhee J, Hoang M, Qureshi AA, Cho E. Consumption of Red Versus White Wine and Cancer Risk: A Meta-Analysis of Observational Studies. Nutrients. 2025;17(3):534. doi:10.3390/nu17030534.
[5] IARC Working Group on the Evaluation of Carcinogenic Risks to Humans. Alcohol drinking. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans. World Health Organization, 1988.
[6] Bagnardi V, Rota M, Botteri E, et al. Alcohol consumption and site-specific cancer risk: a comprehensive dose-response meta-analysis. Br J Cancer. 2015;112(3):580-93. doi:10.1038/bjc.2014.579.
[7] Jung S, Wang M, Anderson K, et al. Alcohol consumption and breast cancer risk by estrogen receptor status: in a pooled analysis of 20 studies. Int J Epidemiol. 2016;45(3):916-28. doi:10.1093/ije/dyv156.
[8] Di Credico G, Polesel J, Dal Maso L, et al. Alcohol drinking and head and neck cancer risk: the joint effect of intensity and duration. Br J Cancer. 2020;123(9):1456-1463. doi:10.1038/s41416-020-01031-z.
[9] National Cancer Institute. Alcohol and Cancer Risk Fact Sheet. cancer.gov.
[10] Jun S, Park H, Kim UJ, et al. Cancer risk based on alcohol consumption levels: a comprehensive systematic review and meta-analysis. Epidemiol Health. 2023;45:e2023092. doi:10.4178/epih.e2023092.
[11] Wiseman KP, Seidenberg AB, Klein WMP. Clinician Role in Patient Awareness Regarding Carcinogenic Nature of Alcohol Consumption in the US: a Nationally Representative Survey. J Gen Intern Med. 2022;37(8):2116-2119. doi:10.1007/s11606-021-07113-9.
[12] Gapstur SM, Bouvard V, Nethan ST, et al. The IARC Perspective on Alcohol Reduction or Cessation and Cancer Risk. N Engl J Med. 2023;389(26):2486-2494. doi:10.1056/NEJMsr2306723.
All other data cited from sources above. NCI Alcohol and Cancer Risk Fact Sheet (cancer.gov) and CDC Alcohol and Cancer page (cdc.gov) were used for verification of risk tables and standard drink definitions.
Disclaimer
This article is for informational purposes only and does not constitute medical advice. The information provided is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read in this article.
This article is published by The Cancer News, a publication supported by Binaytara, an oncology nonprofit.