A new report from the American Cancer Society reveals a concerning trend: one-third of colon cancer cases are now occurring in the rectum. This rise in rectal cancer, particularly among individuals in their 40s, 50s, and 60s, indicates a shift in the demographics affected by this disease. Experts suggest environmental factors, including dietary changes, may be contributing to this alarming increase.
Rectal cancer, often marked by symptoms such as blood in the stool, has seen a dramatic rise. According to the report, the rate of rectal cancers diagnosed in people under 50 doubled between 1998 and 2022. This statistic serves as a stark reminder that colon cancer is increasingly becoming a disease of middle age. As people navigate significant life milestones—such as buying homes, advancing in their careers, and starting families—many are unexpectedly facing this serious health challenge.
Rebecca Siegel, a cancer epidemiologist and the report’s first author, attributes this rise to environmental and behavioral changes that have emerged since the mid-20th century. “It’s some either environmental or behavioral exposure that was introduced in the last half of the 20th century,” she explained. “Whatever this change in exposure was, it’s having a much larger influence on cancer development in the rectum.”
As colon cancer continues to evolve, it has become the deadliest cancer for people under 50. Current data indicates that almost 45% of colon cancer diagnoses are now in individuals under 65. In contrast, the rates of colon cancer in those over 65 have decreased by approximately 2.5% each year.
The trend is not limited to the United States. At least 26 other countries are reporting similar increases in colon cancer among young adults. Alarmingly, three-quarters of colon cancer cases diagnosed in patients under 50 are classified as advanced disease. This means that early detection and awareness are critical.
Despite the rising incidence, many patients, including Laura Behnke, have faced challenges in receiving a timely diagnosis. Behnke, diagnosed with late-stage colon cancer at age 42 shortly after giving birth, initially believed her symptoms were related to pregnancy. “Nobody at any point asked me ‘What’s the bleeding like? How often is it happening?'” she remarked. “We all just said, ‘Oh, hemorrhoids, cool.'”
To combat this rising trend, experts advocate for increased awareness and more frequent screenings. Regular colonoscopies can not only detect cancer but also prevent it by removing precancerous growths. Siegel stresses the importance of normalizing conversations about symptoms. “It’s really important for people to have these conversations with their family at the dinner table,” she emphasized.
Currently, individuals over the age of 45 are advised to undergo regular colonoscopies. For those who may find this option inconvenient, home stool tests, such as the fecal immunochemical test (FIT), are also highly effective at detecting rectal cancers. A study conducted in 2021 found that FIT tests demonstrated the highest sensitivity for rectal tumors among various home tests.
As awareness grows, Siegel urges individuals to be vigilant about symptoms indicating possible colon cancer. “If you do have any sort of symptoms, any sort of concerns, anything that doesn’t feel right, you have every right to go ask a doctor about it and to demand some answers,” she stated.
The changing landscape of colon cancer underscores the need for collective action—both in terms of patient education and medical response. By fostering an environment where discussions about symptoms are normalized, it may be possible to turn the tide against this alarming trend.
