A surge in colorectal cancer cases among adults under 50 has been linked to recent changes in screening guidelines. In 2018, the American Cancer Society updated its guidelines to recommend screening for adults at average risk starting at age 45, while the US Preventive Services Task Force also lowered the recommended age from 50 to 45 in 2021.
Research conducted by the American Cancer Society found that the share of US adults ages 45 to 49 who are up to date on colorectal cancer screening increased from 20.8% in 2019 to 33.7% in 2023. The prevalence of early-stage colorectal cancer diagnoses among this age group also rose, with a 50% relative increase between 2021 and 2022.
While the recent rise in screening may be contributing to the increased number of early-stage cases, it does not explain the overall trend. Colorectal cancer experts say that factors beyond screening guidelines are likely contributing to the ongoing rise in colorectal cancer incidence among younger adults.
To reduce their risk, people can get screened regularly and make lifestyle changes such as maintaining a healthy weight, being physically active, avoiding excessive alcohol consumption, and eating a healthy diet low in red and processed meat. Early detection is key, and symptoms such as rectal bleeding, abdominal cramping, or persistent bowel habits should be watched for. If concerns persist, people should talk to their doctor and get screened when eligible.
According to Elizabeth Schafer, associate scientist of surveillance and health equity science at the American Cancer Society, “We’ve been waiting for screening to take off in this age group… But the real thrill is the translation to early diagnosis, which means less intense treatment and lives saved.”
Source: https://edition.cnn.com/2025/08/04/health/colorectal-cancer-screening-trend