A concerning trend is emerging in the United States: colorectal cancer is now the leading cause of cancer deaths for adults under 50, according to a recent analysis. This shift, impacting a demographic traditionally considered at lower risk, is prompting calls for increased awareness and earlier screening. Experts and those diagnosed with the disease are urging individuals to pay attention to potential symptoms that might otherwise be dismissed as less serious ailments.
Becca Lynch, a 29-year-vintage cybersecurity professional from Denver, Colorado, experienced this firsthand. Initially attributing her symptoms to stress, Lynch noticed changes in her bowel movements – becoming “pencil thin” and occurring five or six times a day – and eventually observed thick, dark blood. She credits an Instagram video from Cass Costley, who shared her own experience with similar symptoms ultimately diagnosed as colon cancer, for prompting her to seek medical attention. Despite this, Lynch delayed a colonoscopy for several months, and was ultimately diagnosed with stage 3B colorectal cancer.
The Changing Face of Colorectal Cancer
Lynch’s story, according to Rebecca Siegel, an epidemiologist and senior director of cancer surveillance research at the American Cancer Society and lead author of the analysis, is increasingly common. Around 75% of individuals under 50 receive an advanced colorectal cancer diagnosis because they haven’t undergone regular colonoscopies and often don’t recognize the seriousness of their symptoms, believing they are too young to be at risk. Many initially suspect hemorrhoids, a common misconception fueled by online search results, Siegel explained.
Costley, who tragically passed away after her diagnosis, also initially believed her symptoms were due to hemorrhoids, as she shared in an interview with Today. Siegel emphasizes the importance of seeking immediate medical attention for rectal bleeding lasting more than a couple of weeks. She also recommends stool tests like Cologuard and the FIT test as initial screening options for those hesitant about a colonoscopy.
A Generational Shift in Cancer Rates
Although colorectal cancer rates continue to decline rapidly – by more than two percent annually – for individuals over 65, the opposite is true for younger adults. Since the 1990s, the disease has risen from being the fifth leading cause of cancer death to the first in this age group. This demographic shift necessitates a change in how doctors approach colorectal cancer treatment, Siegel notes.
“Doctors are used to treating people in their 70s who aren’t concerned about fertility. They’re not as concerned about sexual dysfunction,” Siegel explained. She highlighted the importance of discussing options to preserve fertility and sexual function with younger patients before treatment begins, as many young survivors discover these functions are impacted after treatment is completed.
Unraveling the Causes and Disparities
The reasons behind the rise in colorectal cancer among younger people remain unclear, but experts point to a “birth cohort effect.” This suggests that individuals born after the 1950s face an increased risk, indicating exposure to a risk factor introduced mid-20th century that is progressively increasing the likelihood of developing the disease with each subsequent generation. Possible contributing factors under investigation include changes in diet, with increased consumption of processed foods, processed meats, and foods packaged in plastic.
Siegel noted that research suggests microplastics can cross the blood-brain barrier, raising concerns about potential exposure through the colon. Certain populations also face a disproportionately higher risk; Alaska Natives, for example, have the highest documented colorectal cancer mortality rate globally. However, Siegel emphasized the need for increased funding to study this disparity, as the small population size of Alaska Natives makes research challenging.
Personal Stories Fueling Awareness
Prosanta Chakrabarty, a 47-year-old evolutionary biologist from Baton Rouge, Louisiana, exemplifies the challenges of this rising trend. Despite maintaining a healthy lifestyle and undergoing annual colonoscopies, he was diagnosed with advanced colorectal cancer in 2024 and continues to undergo chemotherapy. Chakrabarty and Lynch are both actively sharing their experiences to combat the “embarrassment” that often delays diagnosis. Lynch hosted an “Question Me Anything” session on Reddit, while Chakrabarty posted a video on Bluesky walking through a giant inflatable colon to raise awareness.
Lynch, now symptom-free but closely monitored, feels compelled to share her story after Costley’s Instagram video led to her diagnosis: “That’s part of why I agreed to an interview about my poop.”
The increasing incidence of colorectal cancer in younger adults underscores the need for heightened awareness, proactive screening, and continued research into the underlying causes. As understanding of this evolving landscape grows, so too will the ability to effectively prevent and treat this increasingly prevalent disease.
Disclaimer: This information is intended for general knowledge and informational purposes only, and does not constitute medical advice. We see essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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