Colorectal Cancer Rising in Younger Adults: New Trends & Screening Insights

The landscape of colorectal cancer is undergoing a significant shift, with rising incidence rates among younger adults even as overall cases decline. A latest analysis, detailed in the Colorectal Cancer Statistics 2026 report, reveals a troubling trend: while colorectal cancer incidence has decreased since 2013 due to declines in older adults, the disease is increasingly affecting individuals under the age of 65, particularly those between 20 and 49 years old. This change underscores the need for increased awareness of screening guidelines and modifiable risk factors, especially as rectal cancer diagnoses are also on the rise after decades of decline.

A Changing Demographic

Colorectal cancer remains the third most common cancer in the United States and the second leading cause of cancer-related death overall. However, it’s now the leading cause of cancer deaths for adults younger than 50. The 2026 report projects 158,850 new cases and approximately 55,230 deaths this year. The data shows a clear divergence in trends: incidence fell 2.5% annually among those 65 and older, while rising 0.4% per year in the 50-64 age group and a concerning 3% per year among young adults aged 20-49. So that nearly 45% of all colorectal cancer cases are now diagnosed in individuals 64 or younger, a significant increase from 27% in 1995.

Rebecca L. Siegel, MPH, senior scientific director of surveillance research at the American Cancer Society and senior author of the report, emphasized the speed of this shift. “The landscape of colorectal cancer is changing rapidly — even more rapidly than I would have expected — and the shift toward more cancer in the younger population is happening swiftly,” Siegel stated in a Healio interview.

Distal Colon and Rectal Cancer Trends

The increase in colorectal cancer isn’t uniform across the entire digestive tract. Incidence of cancers in the distal colon and rectum – generally considered more difficult to treat – is increasing after decades of decline. Rectal cancer, in particular, has seen a resurgence, increasing 1% annually in all age groups combined from 2019 to 2022 and now accounting for 32% of all diagnoses, up from 27% two decades ago. This suggests a potential shift in the underlying causes or risk factors contributing to the disease.

Challenges in Early Detection

A particularly concerning finding is that approximately 75% of colorectal cancers diagnosed in adults younger than 50 are already at an advanced stage, with 27% being distant-stage disease. This highlights the challenges in early detection within this age group, potentially due to a lack of awareness of symptoms or adherence to screening guidelines. Early-onset colorectal cancer – defined as diagnoses before age 50 – is a well-documented phenomenon, but the definitive causes remain elusive.

Researchers estimate that slightly more than half of all colorectal cancer cases are linked to modifiable risk factors, including excess body weight, physical inactivity, smoking, an unhealthy diet, excessive alcohol consumption, and high intake of red or processed meats. However, the increasing incidence in younger adults suggests that other factors may be at play, potentially related to changes in lifestyle, environmental exposures, or even the gut microbiome.

The Role of Screening and Prevention

The U.S. Preventive Services Task Force currently recommends that individuals at average risk begin colorectal cancer screening at age 45. However, screening rates remain suboptimal, particularly among those aged 45 to 49, with only 37% having undergone screening. This is especially critical given that half of all cases diagnosed in this age group occur within that 45-49 window. Individuals with a family history or other risk factors should consider screening even earlier.

Siegel emphasizes the importance of normalizing conversations about colorectal health and reducing the stigma associated with symptoms like blood in the stool or rectal bleeding. “A lot of people have a family history but don’t know it because this topic is taboo,” she explained. “No one — especially young people — wants to talk to their parents or siblings about their colorectal cancer screening results.”

Early detection is paramount, with 5-year survival rates reaching 90% for individuals diagnosed with early-stage disease. Colonoscopy, which allows for both detection and removal of precancerous polyps, plays a crucial role in prevention. “That is a very important selling point in screening messaging,” Siegel added. “I don’t think that is discussed enough.”

Looking Ahead: Research and Support

More research is urgently needed to identify the specific behaviors or exposures driving the spike in early-onset colorectal cancer. As generations born in the latter half of the 20th century age, the overall burden of the disease is expected to increase, “swelling the burden like a tsunami moving through time,” according to Siegel.

Beyond research, providing tailored support for younger patients is essential. Oncologists and healthcare professionals must address the unique needs of this population, including concerns about fertility, sexual health, and the impact of treatment on their careers and family planning.

The American Cancer Society provides resources and information on colorectal cancer prevention, screening, and treatment. You can find more information on their website: https://www.cancer.org/. Individuals with concerns about their risk should consult with a qualified healthcare professional.

For more information:

Rebecca L. Siegel, MPH, can be reached at [email protected].