Approximately 39.2% of Americans will be diagnosed with cancer at some point in their lifetime, based on 2021–2023 data from the National Cancer Institute. That means roughly 2 in 5 people living in the United States will receive a cancer diagnosis before they die. In 2025 alone, an estimated 2,041,910 new cancer cases will be diagnosed, which works out to about 5,600 new diagnoses every day.
How Age Affects Your Risk
Cancer is overwhelmingly a disease of aging. The median age at diagnosis is 67, meaning half of all cancer cases occur in people older than that. Incidence rates climb steeply with each decade of life: fewer than 26 cases per 100,000 people occur in age groups under 20, compared to about 350 per 100,000 among people aged 45 to 49, and more than 1,000 per 100,000 in age groups 60 and older.
Only about 1% of all cancers are diagnosed in children and adolescents. Certain types do skew younger, though. For example, 11% of brain and nervous system cancers are diagnosed in children and teens. But the overall pattern is clear: the older you get, the higher your risk climbs.
The Most Common Types
A handful of cancer types account for a large share of all diagnoses. Based on 2025 estimates from the National Cancer Institute, the five most common cancers in the United States are:
- Breast cancer: 319,750 new cases
- Prostate cancer: 313,780 new cases
- Lung cancer: 226,650 new cases
- Colorectal cancer: 154,270 new cases
- Melanoma: 104,960 new cases
Breast and prostate cancer together represent more than 600,000 diagnoses per year, nearly a third of the national total. Lung cancer, while third in new cases, remains the leading cause of cancer death.
40% of Cases Are Linked to Preventable Factors
A large American Cancer Society study found that 4 in 10 cancer cases and nearly half of all cancer deaths in adults 30 and older are tied to modifiable risk factors. That translated to roughly 713,340 preventable cases and 262,120 preventable deaths in a single year (2019).
Cigarette smoking is the single largest contributor, responsible for nearly 20% of all cancer cases and about 30% of all cancer deaths. Excess body weight is the second biggest factor, linked to 7.6% of cases, followed by alcohol consumption at 5.4%, UV radiation exposure at 4.6%, and physical inactivity at 3.1%. These numbers mean that lifestyle changes, particularly quitting smoking and maintaining a healthy weight, have a measurable impact on population-level cancer risk.
How Many People Are Living With Cancer
As of May 2025, an estimated 18.6 million cancer survivors are living in the United States, representing about 5.4% of the total population. This number includes anyone who has ever been diagnosed with cancer, whether they completed treatment decades ago or are still undergoing it.
The survivor population has been growing for years, driven by earlier detection and more effective treatments. Of the roughly 2 million new cases diagnosed each year, about 618,120 people are expected to die from the disease in 2025. That means most people who receive a cancer diagnosis will survive it, though outcomes vary enormously depending on the type and stage at detection.
What These Numbers Mean in Context
A 39.2% lifetime risk sounds alarming, but it’s important to understand what that figure captures. It spans an entire lifetime, typically 75 to 80 years, and includes every type of cancer from highly treatable skin cancers to aggressive late-stage diagnoses. Your individual risk at any given age is much lower than the cumulative lifetime number suggests, particularly if you’re under 50.
The number also doesn’t account for personal risk factors. A nonsmoking, physically active person at a healthy weight has meaningfully lower odds than the population average. Conversely, someone who smokes and is sedentary carries higher risk. The 39.2% is a statistical snapshot of the entire U.S. population, not a prediction for any individual.