Cancer: Symptoms, Tests, Treatment and How to Lower Your Risk
Junaid Tahir
Cancer Explained: Symptoms, Tests, Treatment and How to Lower Your Risk
Cancer Explained: Symptoms, Tests, Treatment and How to Lower Your Risk Reading time: 16 minutes | Last updated: September 2026 It feels...
Cancer Explained: Symptoms, Tests, Treatment and How to Lower Your Risk
Reading time: 8-9 minutes | Last updated: September 2026
It feels like cancer is everywhere now. Fifteen or twenty years ago, most of us knew only a few people who had it. Today we hear about men and women in their 30s and 40s being diagnosed. So is cancer really becoming more common, or does it just feel that way?
The honest answer is: a bit of both. This guide explains in simple words what cancer is, what causes it, which warning signs to watch for, which tests are recommended, how it is treated, and which healthy habits can lower your risk. It uses recent data from the World Health Organization (WHO), the American Cancer Society (ACS) and leading cancer research groups, as of September 2026.
Quick answers
- Worldwide, about 20.6 million people were diagnosed with cancer in 2024, and nearly 10 million die from it each year (WHO Global Status Report on Cancer 2026).
- In the US, five-year survival for all cancers combined reached a record 70%, and cancer death rates are down 34% since 1991 (American Cancer Society (ACS) Cancer Statistics, 2026).
- But cancers in people under 50 are rising, especially colorectal (bowel) and breast cancer.
- Nearly 4 in 10 cancer cases are linked to risks we can reduce, such as tobacco, alcohol, excess weight, inactivity and some infections.
- Screening and paying attention to symptoms can catch cancer early, when it is much easier to treat.
In this article
- Is cancer really becoming more common?
- What is cancer?
- What causes cancer?
- Why are more young people getting cancer?
- Common warning signs and symptoms
- How is cancer tested and diagnosed?
- Recommended screening tests
- How to lower your risk: a healthy lifestyle
- How is cancer treated?
- Latest research and trends in 2026
- Conclusion and your simple action plan
- Sources and further reading
Is Cancer Really Becoming More Common?
Two things are true at the same time. Fewer people are dying of cancer in some countries, but the total number of cases and the number of young patients are going up.
| The good news | The worrying news |
|---|---|
| US cancer death rates have fallen 34% since 1991. About 4.8 million deaths have been avoided. | Worldwide, cancer cases could rise from about 20.6 million a year to nearly 35 million by 2050 if nothing changes. |
| Five-year survival for all cancers combined hit 70% for people diagnosed in 2015–2021. In the mid-1970s it was about 50%. | Cancers in adults under 50 are rising. The American Association for Cancer Research (AACR) reports that early-onset cancers are up more than 15% since 2000. |
| Survival has jumped for some of the hardest cancers since the mid-1990s: myeloma (32% to 62%) and liver cancer (7% to 22%). | Breast cancer is rising, especially in women under 50. Colorectal cancer is also rising in adults under 50. |
| The main reasons are less smoking, earlier detection and better treatment. | Access is unequal. Fewer than one in three countries include cancer care in their universal health coverage packages. |
Sources for the US figures: ACS Cancer Statistics 2026, published in CA: A Cancer Journal for Clinicians. Global figures: WHO 2026 report linked above.
Why do total cases keep rising even when death rates fall?
- People are living longer. Cancer risk goes up with age, so an older population means more cases.
- Populations are growing. More people means more diagnoses in total.
- Better testing. Screening finds some cancers earlier, and some that might once have been missed.
- Lifestyle and environment. WHO’s cancer agency (IARC) says the cancer picture is increasingly driven by obesity, physical inactivity, unhealthy diets and air pollution.
A note about the numbers
Most detailed statistics in this article come from the United States, because it publishes the most complete yearly data. Rates differ from country to country. Forecasts such as the 2050 figure are projections, not certainties. Ask your local health authority about numbers and screening programs in your own country.
What Is Cancer?
Your body is made of trillions of tiny cells. Healthy cells grow, divide and die in an orderly way, and old cells are replaced by new ones.
Cancer starts when the DNA inside a cell is damaged. The damaged cell stops following the rules. It keeps dividing and does not die when it should. Over time, the extra cells can form a lump called a tumor. Cancer cells can also break away and spread to other parts of the body. This spreading is called metastasis.
- Cancer is not one disease. There are more than 100 types. Most are named after the body part where they start, such as breast, lung or colon cancer.
- Some cancers do not form a lump. Blood cancers such as leukemia are examples.
- Doctors use “stages” (0 to IV) to describe how far a cancer has grown or spread. An earlier stage usually means easier treatment and better survival.
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