Medical Writer: Janefrances Ugochi Ozoilo, MBBS, FMCPH, MSc (PH), PMP

Medical Reviewer: Azuka Chinweokwu Ezeike, MBBS, FWACS, FMCOG, MSc (PH)

Highlights

• The World Health Organisation confirmed in 2023 that no amount of alcohol is safe, placing it alongside tobacco and asbestos as a known carcinogen responsible for new cancer cases globally.
• Alcohol is converted to a toxic substance called acetaldehyde that attacks and damages body cells, allowing other carcinogens to enter cells more easily.
• At least seven cancers are directly linked to alcohol, including cancers of the mouth, throat, voice box (Larynx), oesophagus, liver, breast, colon, rectum, and stomach.
• There is no safe or moderate drinking threshold, as cancer risk increases gradually with every drink, even at low levels. 
• Risk can be meaningfully reduced by setting weekly drink limits, introducing alcohol-free days, measuring pour sizes, and avoiding mixing alcohol with tobacco. 
• Common beliefs about alcohol are largely myths and are unsupported by current evidence.

The Link Between Alcohol and Cancer

Introduction

Did you know that even a small amount of alcohol can increase your risk of cancer? This fact often surprises people. For many years, having a glass of wine with dinner or a beer at a barbecue seemed harmless. Some even thought it was good for the heart. But now, science shows a clearer picture.

According to the World Health Organisation drinking any amount of alcohol is not safe for our health. The risk of cancer starts with the first drop. Scientific evidence group alcoholic drinks with tobacco, asbestos, and radiation, which are all known to cause cancer. In 2020 alone, alcohol was linked to about 741,300 new cancer cases [1].

This article explains how alcohol can harm your body and which cancers are linked to drinking. It also clarifies what "moderate" drinking means and offers practical steps to reduce your risk. The aim is not to scare you, but to provide clear, honest information so you can make choices that suit your life.

Understanding the Link: How Alcohol Affects the Body

When you drink alcohol, your body needs to break it down. This process can cause healthy cells to become cancerous over time. Scientists have found at least four main ways this happens.

• It turns into a harmful substance.

Once alcohol enters your body, your liver breaks it down into a substance called acetaldehyde. Acetaldehyde damages DNA, the instruction manual inside every cell, and stops cells from repairing themselves properly. When that damage builds up, healthy cells can become cancer cells.

• It causes damage to cells.

When alcohol breaks down, it creates unstable molecules called reactive oxygen species. These molecules can harm DNA, proteins, and the fatty parts of your cells.

• It changes hormone levels.

Alcohol can increase levels of oestrogen and other hormones that affect breast tissue. More oestrogen over time is one reason alcohol is linked to breast cancer.

• It irritates tissue and helps other carcinogens enter cells.

Alcohol goes straight through the lining of your mouth, throat, and oesophagus. It breaks down the protective layers there, making it easier for harmful chemicals, like those in tobacco smoke, to enter cells. This is why people who drink and smoke have a much higher risk of head and neck cancers [2,3].

Here's something important to keep in mind: the risk of cancer is linked to the alcohol itself, not the type of drink. Whether it's beer, wine, spirits, or cider, they all have the same risk per gram of pure alcohol.

Types of Cancer linked to Alcohol

There is evidence that alcohol is linked to at least seven types of cancer. The link is strongest in body parts that touch alcohol directly or help break it down.

• Mouth, throat, and voice box cancers

Alcohol touches these areas every time you drink. People who drink a lot have about five times the risk of getting mouth and throat cancers compared to those who don't drink. The risk is even higher if they also smoke.

• Oesophagal cancer

The oesophagus is directly affected by alcohol. Drinking is strongly linked to a type of cancer called squamous cell carcinoma of the oesophagus, especially in people who process acetaldehyde slowly.

• Liver cancer

Drinking for a long time can cause liver damage and scarring (cirrhosis). Over time, this scarring increases the risk of hepatocellular carcinoma, the most common liver cancer.

• Breast cancer

This connection surprises many. Even one drink a day can increase a woman's risk of breast cancer, and the risk goes up with more drinks. Alcohol is now seen as a common risk factor for breast cancer.

• Colon and rectal (colorectal) cancer

Regular drinking is linked to higher rates of cancer in the lower digestive system.

• Stomach cancer

Studies have added stomach cancer to the list of alcohol-related cancers, especially with heavy drinking [6].Researchers are still studying links to other cancers, like pancreatic and prostate cancer, but the ones mentioned above have the strongest and most consistent evidence today [1,3,4,5,6].

How Much Alcohol Is Too Much? 

Many people think there is a clear line between safe and unsafe drinking. But new research says this is not true. The risk of cancer does not suddenly increase at a certain number of drinks. Instead, it goes up slowly as you drink more, even at levels once thought to be safe.

• A “standard drink” is smaller than many people think.

In the United States, a standard drink is about 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of spirits like vodka, gin, rum, or whiskey. Drinks poured at home are often larger, so one glass at home might be more than one drink.

• Moderate drinking still has limits.

Moderate drinking means up to one drink a day for women and up to two drinks a day for men. Drinking more than this can harm your health.

• Heavy drinking includes binge drinking.

Heavy drinking means drinking too much often or having a lot of drinks at once. For women, binge drinking is having four or more drinks at one time. For men, it is five or more drinks at one time.

• Light drinking does not mean no risk.

Even people who drink a little, like one drink a day or less, might have a higher chance of getting some cancers compared to those who do not drink alcohol at all.

• The risk builds up over a lifetime.

Drinking a lot in one night is not the only concern. Drinking a little every day can also add up over time, increasing the total amount of alcohol your body has taken in.

• Some people are more affected by alcohol than others.

Genes can change how the body processes alcohol. Some people, especially many East Asians, might have a gene that makes a harmful substance called acetaldehyde build up quickly.

• Other risk factors can add to alcohol’s effects.

Smoking, obesity, hepatitis B or C infection, and a family history of cancer can increase cancer risk further when combined with alcohol use.The safest message is not that "a little alcohol is harmless." It is better to say that drinking less alcohol usually means lower risk, and not drinking at all avoids any risk of alcohol-related cancer.

8 Practical Steps to Lower Your Risk of Alcohol Related Cancer

Drinking less alcohol lowers your cancer risk. You do not have to quit completely to see benefits. Studies show that the risk of some cancers linked to alcohol goes down within a few years of drinking less or stopping.Here are some practical steps that can help.

• Set a weekly drink limit and try to stay under it. Decide how many drinks you will have before the week starts and stick to that number. It's often easier to count drinks than to decide in the moment.
• Have alcohol-free days. Choose two or three days each week when you don't drink at all. This helps break the habit and lets your body rest.
• Be careful with how much you pour. Use a smaller glass, measure spirits with a jigger, and order a half-pint instead of a full pint.
• Keep less alcohol at home. If it's not there, you'll drink less. Buy small amounts and keep them out of sight.
• Make a list of non-alcoholic drinks you like. Sparkling water with lemon, alcohol-free beer, kombucha, or a good mocktail can be just as social as a regular drink.
• Do not mix alcohol with tobacco. Together, they increase the risk of head, neck, and throat cancers more than each one alone.
• Stay up to date with cancer screenings. They can find some cancers, like breast, colon, and cervical, early when treatment works best. Ask your doctor which screenings you need based on your age and history.
• Ask for help if you need it. If cutting back is hard, it's important to know, not a failure. Talking to your doctor can lead to counselling, support groups, and helpful medications.

Common Myths and Facts About Alcohol Intake

• Myth: “Red wine is good for the heart, so it must be safe.”

Fact: Red wine has plant compounds called polyphenols. Some old studies said light drinking might help the heart a little. But new, better studies say this is not true. Any small heart benefit is not worth the cancer risk. The American Heart Association says people should not start drinking alcohol to protect their hearts.

• Myth: “I only drink on weekends, so I am fine.”

Fact: The total amount of alcohol you drink over time is important. Consuming an excessive amount of alcohol within a short time, especially on weekends, is called binge drinking. This gives your body a large amount of alcohol at once, which can harm your health and increase the risk of cancer.

• Myth: “I do not drink heavily, so cancer risk does not apply to me.”

Fact: Drinking even small amounts of alcohol can increase the risk of some cancers. This is especially true for breast cancer in women and cancers of the mouth, throat, and oesophagus. The risk is lower than with heavy drinking, but it is still present.

• Myth: “Organic, craft, or low-calorie alcohol is healthier.”

Fact: The risk of cancer comes from the alcohol itself. A craft beer, organic wine, and hard seltzer with the same amount of alcohol have the same risk related to alcohol.

Conclusion

Alcohol is linked to cancer and is a risk we can avoid. Unlike genes, drinking is a choice we make every day. Start with small changes: have an alcohol-free night, use a smaller glass, or choose sparkling water instead. Each step reduces risk and helps build better habits. If it's hard to cut back, talk to a doctor. Asking for help is a sign of strength, and support is available. Your health tomorrow depends on the choices you make today, and skipping a drink is a positive step.

References

[1] Rumgay H, Shield K, Charvat H, et al. Global burden of cancer in 2020 attributable to alcohol consumption: a population-based study. The Lancet Oncology 2021; 22: 1071–1080. Available from: https://doi.org/10.1016/S1470-2045(21)00279-5

[2] Alcohol and Cancer Risk Fact Sheet - NCI, https://www.cancer.gov/about-cancer/causes-prevention/risk/alcohol/alcohol-fact-sheet (2021). Available from: https://www.cancer.org/cancer/risk-prevention/diet-physical-activity/alcohol-use-and-cancer.html

[3] LoConte NK, Brewster AM, Kaur JS, et al. Alcohol and Cancer: A Statement of the American Society of Clinical Oncology. JCO 2018; 36: 83–93. Available from: https://doi.org/10.1200/JCO.2017.76.1155 

[4] 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: 580–593.Available from: https://doi.org/10.1038/bjc.2014.579

[5] Chen WY, Rosner B, Hankinson SE, et al. Moderate Alcohol Consumption During Adult Life, Drinking Patterns, and Breast Cancer Risk. JAMA 2011; 306: 1884. Available from: https://doi.org/10.1001/jama.2011.1590 

[6]     Tramacere I, Negri E, Pelucchi C, et al. A meta-analysis on alcohol drinking and gastric cancer risk. Ann Oncol 2012; 23: 28–36. Available from: https://pubmed.ncbi.nlm.nih.gov/21536659/

Disclaimer:
The information provided on this website is for general educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Published May 19, 2026