Small practical actions can help reduce risk

Cancer prevention means taking action to lower the chance that cancer develops. It can include avoiding a known cancer-causing exposure, supporting health through everyday habits, using vaccination where recommended and creating safer homes, workplaces and communities.

Cancer develops through a complex interaction of age, genetic factors, exposures and changes inside cells. Some risks can be changed, some cannot, and some are only partly within an individual’s control.

A prevention message should help, not judge. People live with different incomes, jobs, disabilities, health conditions, family responsibilities, food choices, transport, housing, marketing and access to healthcare.

Developing cancer does not prove that someone made the wrong choices. A person can follow health guidance and still become ill. Another person may face risks they cannot easily avoid. KCK focuses on supportive action and wider conditions rather than perfection.

Tobacco is a major preventable cause of cancer. The World Health Organization states that all forms of tobacco use are harmful and that there is no safe level of exposure. Tobacco includes cigarettes, cigars, pipes, bidis, waterpipe tobacco, heated tobacco and smokeless products.

Second-hand tobacco smoke also causes harm, including lung cancer. A smoke-free home and vehicle can protect other people as well as support someone who is trying to stop.

Nicotine dependence can be difficult to overcome. Counselling and approved medicines can help, and needing support is normal. Use a current stop-smoking service or qualified professional in your country.

Regular physical activity supports health and is associated with lower risk of several cancers. Movement includes walking, wheeling, cycling, active travel, work, household activity, play, exercise and sport. It does not need to happen in a gym.

That is the World Health Organization’s advice. Adults generally work towards at least 150 minutes of moderate-intensity activity each week, with muscle-strengthening activity as well. A brisk walk is one example of moderate activity, but the right level depends on the person.

Start from what is safe and possible. Short periods count and can be spread across the week. If you have a health condition, disability, pain, recent surgery, pregnancy or treatment that affects activity, ask an appropriate professional for guidance that fits you.

No single food prevents cancer. A useful long-term pattern includes plenty of wholegrains, vegetables, fruit and beans. These foods provide fibre and other nutrients and can replace some highly processed, energy-dense choices.

World Cancer Research Fund recommends limiting processed meat and eating only moderate amounts of red meat. It also recommends limiting fast foods and other highly processed foods high in fat, starches or sugars, and limiting sugar-sweetened drinks.

You do not need an expensive superfood, detox or special cancer-prevention product. Supplements should not be used to prevent cancer unless a qualified professional recommends one for a specific need. More is not always safer, and supplements can interact with medicines.

Food is shaped by culture, cost, availability, disability, health and family life. Begin with one practical addition or swap that works in your setting. If cancer treatment, swallowing problems, an eating disorder or unplanned weight change affects eating, use your clinical team or a qualified dietitian rather than a general prevention plan.

Higher levels of body fat are linked with increased risk of several cancers. This does not mean that weight is the only cause of cancer, that a person is to blame or that weight loss guarantees prevention.

Weight is influenced by genetics, hormones, medicines, disability, sleep, stress, mental health, pregnancy, ageing, food access, income and the wider environment. The World Health Organization describes obesity as a complex, chronic and relapsing disease rather than a simple result of willpower.

Regular movement and a varied, fibre-rich food pattern can support health even when the number on a scale changes slowly or not at all.

Alcohol can cause cancer. The World Health Organization describes alcohol as an established carcinogen and states that there is no risk-free form of alcohol consumption. Cancer risk generally rises as the amount consumed increases.

The type, price or quality of the drink does not remove the risk because ethanol is the harmful substance in beer, wine and spirits.

If you want to reduce, begin with a change you can sustain, such as alcohol-free days, smaller servings or replacing some drinks.

Ultraviolet radiation, or UV, comes from the sun and artificial tanning devices such as sunbeds. Too much UV can damage DNA in skin cells and increase skin-cancer risk. Damage can happen to every skin tone, although the chance of burning and the way changes appear can differ.

Avoid sunbeds and try to prevent sunburn. When UV levels are high, combine protection rather than relying on one product.

Reapply sunscreen according to the product instructions and after swimming, sweating or towelling. Sunscreen does not make long periods in strong sun harmless. Babies and children need particular care, and some medicines or health conditions can increase sensitivity. Check local UV information and ask a pharmacist or healthcare professional if you are unsure.

Some infections can increase cancer risk. Important examples include human papillomavirus, or HPV, and hepatitis B and C. Prevention, vaccination, testing and treatment depend on the infection and the person’s circumstances.

Vaccination schedules, eligibility, doses and screening routes vary by country, age and health circumstances. Check your records and use a current official service. KCK does not decide whether you or a child should receive a vaccine or test.

Cancer risk is also shaped by the air people breathe and the substances they meet at work or at home. The World Health Organization identifies these among exposures that need prevention and control:

An individual may have limited power over these risks. Employers, landlords, manufacturers and governments all have responsibilities. Follow workplace controls, use the protective equipment provided for the task and report damaged materials or unsafe exposure through the appropriate route.

Radon advice, air-quality alerts and occupational rules vary by country and area. Use a national environmental or workplace authority for local action. KCK does not test homes, workplaces or products.