Even a single daily drink could be enough to raise the risk of cancer, according to a major global study that delivers one of the strongest warnings yet about alcohol’s impact on human health.

The massive analysis, covering 843 scientific studies and millions of people worldwide, found that alcohol is linked to a wide range of serious diseases, with cancer risks increasing even at low levels of drinking.

Researchers declared that the findings reinforce a blunt scientific reality that alcohol is a known cause of cancer, officially classified as a Group 1 carcinogen, the same category as tobacco and asbestos.

And crucially, they warn there may be no completely safe level of consumption.

The study, published in Nature Health, had examined alcohol’s effects on 20 major diseases, including multiple cancers, liver failure, heart disease, infections, and brain disorders. Across almost every category, the risks rose as drinking increased, but in several cancers, damage began at surprisingly low intake levels.

One of the most alarming findings involved cancers of the throat and upper airways. Drinking around two alcoholic drinks a day (20g of alcohol) was associated with a 56% higher risk of certain pharyngeal cancers compared with non-drinkers. At higher levels, the danger escalated sharply, with risk more than tripling in some cases.

The study also found strong links between alcohol and cancers of the mouth, oesophagus, liver, colon, rectum, breast and pancreas, all diseases known for high mortality rates and difficult treatment outcomes.

Researchers warned that alcohol’s cancer risk is not limited to heavy drinkers. Even relatively low consumption was associated with increased cancer risk, challenging the widespread belief that moderate drinking is harmless.

Beyond cancer, the study found serious damage across multiple organs.

At moderate-to-high intake levels, alcohol was linked to more than double the risk of liver cirrhosis and chronic liver disease, conditions that gradually destroy the liver and can lead to organ failure and death.

Alcohol was also associated with pancreatitis, a painful and potentially life-threatening inflammation of the pancreas, and atrial fibrillation, a heart rhythm disorder that raises the risk of stroke and sudden cardiac complications.

Some earlier research has suggested that small amounts of alcohol might offer limited protection against conditions such as heart disease, dementia, and diabetes. However, the authors of the new study explained that these findings are uncertain and likely influenced by differences in lifestyle, diet, and health status between drinkers and non-drinkers.

Importantly, any possible protective effects disappeared as alcohol intake increased, while cancer risks continued to rise.

At higher levels of drinking, alcohol was linked to increased risk across every major disease studied.

The researchers also warned of a major public awareness gap. While most people understand the link between smoking and cancer, far fewer realise that alcohol is also a direct carcinogen.

“This is not just a lifestyle issue; it is a cancer risk issue,” the study implies through its findings, highlighting alcohol as one of the most widespread avoidable causes of disease globally.

The authors called for stronger public warnings, clearer labelling, and updated health guidance that reflects alcohol’s cancer risk more directly.

They concluded that while individual risk depends on factors such as age, genetics, and drinking patterns, the overall trend is unmistakable: the more you drink, the more you increase your risk of serious disease, especially cancer.

For millions of people who see alcohol as a normal part of daily life, the message from this landmark study is stark: even “moderate” drinking may come with a hidden cost, and that cost could be cancer. (Nigerian Tribune)

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