Lung cancer is the most common cancer in the world, with 2.5 million new cases diagnosed in 2022, accounting for 12.4% of all cancers globally. Female breast cancer comes in a close second at 2.3 million cases (11.6%), followed by colorectal cancer (1.9 million), prostate cancer (1.5 million), and stomach cancer (970,000). That said, the answer shifts depending on whether you’re looking at global or U.S. numbers, men or women, or which cancers are deadliest rather than most diagnosed.
A Recent Shift at the Top
Lung cancer hasn’t always held the top spot. In 2020, female breast cancer actually overtook lung cancer for the first time as the world’s most commonly diagnosed cancer, with breast cancer making up 11.7% of new cases compared to lung cancer’s 11.4%. By 2022, lung cancer had reclaimed the lead. The two are close enough that they essentially trade places depending on the year, with colorectal cancer a consistent third.
The U.S. Picture Looks Different
In the United States, roughly 2.1 million people will be diagnosed with cancer in 2026. The rankings here don’t match the global list. Prostate cancer leads with an estimated 333,830 new cases, followed by female breast cancer at 321,910 and lung cancer at 229,410. Colorectal cancer ranks fourth at 158,850 cases, and melanoma rounds out the top five at 112,000.
Further down the list, bladder cancer (84,530 cases), kidney cancer (80,450), non-Hodgkin lymphoma (79,320), uterine cancer (68,270), and leukemia (67,790) complete the top ten. One notable absence from these rankings: non-melanoma skin cancers like basal cell and squamous cell carcinoma. These are widely believed to be the most frequently occurring cancers of all, but cancer registries don’t track them, so exact numbers don’t exist. They’re excluded from virtually every “most common cancer” list for this reason.
Most Common vs. Most Deadly
The cancer diagnosed most often is not the cancer that kills the most people. Lung cancer holds that grim distinction in both the U.S. and worldwide. In the U.S., an estimated 124,990 people will die from lung cancer in 2026. That’s nearly three times the 55,230 deaths expected from colorectal cancer, the second leading cause of cancer death.
Pancreatic cancer reveals the starkest gap between incidence and mortality. It ranks outside the top five for new diagnoses (67,530 cases), yet it’s the third deadliest cancer with 52,740 expected deaths. That means roughly 78% of people diagnosed with pancreatic cancer in a given year will die from it. Compare that to prostate cancer: 333,830 new diagnoses but 36,320 deaths, reflecting a far higher survival rate. Breast cancer shows a similar pattern, with 324,580 diagnoses and 42,670 deaths.
Differences Between Men and Women
When you split the numbers by sex, entirely different cancers dominate. For men in high-income countries, prostate cancer is by far the most common, making up 19.1% of all male cancer diagnoses. Lung cancer is second at 11.5%, and colorectal cancer third at 10.4%.
For women, breast cancer accounts for a full quarter of all diagnoses (25.4% in high-income countries). Colorectal cancer is second at 10.3%, followed by lung cancer at 9.4%. This means a woman’s lifetime risk of being diagnosed with breast cancer is substantially higher than any single cancer type is for men, even though prostate cancer leads the overall male rankings by a wide margin in raw numbers.
How Age Changes the Rankings
Cancer is overwhelmingly a disease of aging. Incidence rates climb steadily from fewer than 26 cases per 100,000 people in those under 20 to more than 1,000 per 100,000 in people 60 and older. The median age at diagnosis across all cancers is 67 years.
Each of the major cancers tends to strike in a specific age window. Breast cancer has a median diagnosis age of 63, colorectal cancer 66, prostate cancer 68, and lung cancer 71. In children and adolescents, the most common cancers are completely different from the adult list. Bone cancer is most frequently diagnosed in people under 20, with about one-quarter of all bone cancer cases occurring in this age group. Brain and nervous system cancers also skew young: 11% of those diagnoses occur in children and adolescents, even though only 1% of all cancer diagnoses happen before age 20.
Why Rankings Vary by Country
The “most common” cancer depends heavily on where you live. In high-income countries, breast, lung, and prostate cancers dominate because populations live long enough for these age-related cancers to develop, and screening programs catch cases that might go undiagnosed elsewhere. Stomach cancer, which ranks fifth globally with 970,000 cases, is far more prevalent in East Asia and parts of South America than in Western countries, driven by higher rates of a specific bacterial infection and dietary factors. Cervical cancer, which doesn’t crack the top ten in wealthy nations, remains one of the leading cancers in low-income countries where HPV vaccination and screening programs are less available.
These geographic differences mean that global rankings reflect the sheer population size of certain regions as much as they reflect universal biology. Lung cancer’s position at the top of the global list is driven largely by high smoking rates in parts of Asia and persistent tobacco use worldwide, while prostate and breast cancer dominate in countries with widespread screening infrastructure.