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What is Cancer?
Cancer describes a group of diseases in which some of the body's cells grow uncontrollably and can spread to other parts of the body. It can start almost anywhere in the body's trillions of cells, and there are more than 100 different types.
This page is an educational overview compiled from public health sources listed below. It is not medical advice. If you or someone you know has health concerns, please talk to a doctor or another trusted healthcare provider.
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Common Warning Signs
No symptom on its own confirms cancer, but these changes are worth discussing with a doctor if they persist:
- Unexplained weight loss
- Persistent fatigue that doesn't improve with rest
- New lumps, or lumps that grow or change
- Unusual bleeding or bruising
- Changes in bowel or bladder habits
- A cough or hoarseness that doesn't go away
- Sores that don't heal or skin changes
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Known Risk Factors
Some risk factors can be changed, others can't. Understanding both helps put prevention advice in context:
Factors you can influence
- Tobacco use (linked to multiple cancer types, not just lung cancer)
- Excess alcohol consumption
- Prolonged unprotected sun/UV exposure
- Physical inactivity and diet low in vegetables and fruit
Factors you can't change
- Age — risk increases for most cancers as people get older
- Family history and inherited gene changes
- Certain chronic infections (e.g. HPV, Hepatitis B/C)
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Screening & Early Detection
Screening looks for cancer before symptoms appear, when treatment tends to be most effective. Recommended screenings vary by age, sex, and personal/family history — a doctor is the right person to advise on individual screening schedules. Common examples include mammograms, colonoscopies, Pap tests, and skin checks.
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Myths vs. Facts
- Myth: Cancer is always hereditary. Fact: Only about 5–10% of cancers are linked directly to inherited gene mutations — most result from a combination of factors.
- Myth: Sugar directly feeds cancer cells. Fact: All cells, cancerous or not, use sugar (glucose) for energy; there's no credible evidence that cutting sugar alone starves a tumor.
- Myth: A cancer diagnosis is always terminal. Fact: Survival rates vary widely by type and stage, and many cancers are highly treatable, especially when caught early.
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Support for Patients & Families
A diagnosis affects the whole family, not just the patient. Support commonly includes medical care teams, counselling, peer support groups, practical help with daily tasks, and financial assistance programs offered through hospitals and nonprofit organizations.
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Sources & Further Reading
Compiled and reviewed by the Polaris Youth editorial team. Last reviewed: July 2026. This page is for general education only and does not replace professional medical advice.