Colorectal cancer, once considered a condition affecting primarily those over the age of 50, is no longer limited to aging adults. The disease is increasingly affecting younger adults—millennials and even members of Gen Z. A report by American Cancer Society reveals that every generation of people born after 1950 is experiencing a higher risk of colorectal cancer, a trend that has left researchers and medical professionals stunned.The disease, which includes both colon and rectal cancers, is growing most rapidly in adults 20 to 39 years old, with a 2% average annual rate of increase in incidence since the mid-1990s. This epidemiologic transition is causing legitimate public health alarms—and at the core of the crisis is an alarming fact: the most likely symptom of colon cancer is one that many will be too ashamed to discuss.One Symptom That Should Never Be IgnoredIn a 2024 study by Joshua Demb, assistant professor and researcher of early-onset colon cancer at the University of California, San Diego, rectal bleeding was the most specific and common early symptom in young adults with colorectal cancer. And yet, it's the one that many people—particularly millennials—are least likely to mention.Through his interviews with patients, Demb discovered a shared pattern- patients held off on coming in for care because they were embarrassed to discuss "poop" or blood in their stool. This resistance is not anecdotal alone—it is a deeper cultural taboo dating back centuries, especially in Western cultures where bathroom behavior has always been tainted by shame.Blowing off blood in the toilet or denying pencil-thin stools as benign gastrointestinal problems might cost lives. "When young adults finally come forward, their cancer has usually advanced beyond it should have," Demb said. "Shame about bowel movements can add to delay in diagnosis in a disease where timing is everything."Why Young People Are at Greater Risk?Although colorectal cancer is still a slow-growing cancer, specialists caution that its increase among young adults may be the result of both genetic susceptibility and lifestyle choices.Dietary patterns including high consumption of red and processed meats, low fiber intake, physical inactivity, increased prevalence of obesity, and higher alcohol and tobacco consumption are all potential drivers of this trend. The World Cancer Research Fund suggests aiming for less than 18 oz per week of red meat and focusing on a high-fiber, plant-based diet to lower the risk of colorectal cancer."We're observing increasingly urbanized, digitally connected young patients with rapid food intake, extended sitting times, and minimal physical activity," says Dr. Maria Ellis, an oncologist who specializes in gastrointestinal cancers. "These habits likely lead to inflammation and alterations in the gut microbiome, all conducive to the initiation of early tumors." The Challenges with Current Screening GuidelinesOne of the largest updates to solving this health crisis is screening age eligibility. Routine colonoscopies are suggested beginning at age 45 to 50 in most countries, including the U.S. But if the demographic that is growing quickest is under 40, this model is already outdated.Even when young adults come with typical presentations—chronic abdominal pain, change in bowel habits, or bleeding per rectum—the suspicion of cancer is usually ignored by patients and doctors. Colonoscopies are painful, costly (several thousand dollars without insurance), and seldom prescribed for individuals in their twenties or early thirties unless there is a family history."There's still a lingering thought among primary care doctors that cancer is an 'older person's disease,'" says Dr. Ellis. "That results in young patients being misdiagnosed with hemorrhoids, irritable bowel syndrome, or anxiety-related gastrointestinal issues."Psychological Burden on Young AdultsFor young adults and adolescents (AYA), a cancer diagnosis disrupts not only health, but also identity, education, relationships, and planning for the future. A 2025 study presented at the American Society of Clinical Oncology (ASCO) identified four core areas of support lacking in AYA cancer treatment: academic accommodations, loss of extracurricular activities, disruption of career trajectory, and loss of peer affiliation.This age group is typically just starting out in their adult lives—beginning careers, dating, or establishing families. Stigma of "poop talk" creates another layer of loneliness and humiliation, compounding the delay in diagnosis and treatment.How to Identify a Red Flag?Many of the initial symptoms of colon cancer will look like other diseases like celiac disease, irritable bowel syndrome, or hemorrhoids. But the most important clue to look for is a change from your usual pattern of digestion. If your bowels suddenly change—and remain changed—it's time to see a doctor.Other signs include:Rectal bleedingUnexplained abdominal painChronic diarrhea or constipationPencil-thin stoolsFatigue or unexpected weight lossYoung adults should not be afraid to speak up for themselves in doctor's offices, even when they do not have a family history of cancer. A second opinion, particularly in the case of a persistent symptom, can be the difference between life and death.Why Talking About Stool Could Be Life-Saving?The cultural shame of defecation runs deep—but it's time to break it. Public health initiatives need to incorporate plain language that de-stigmatizes important bodily functions. As Dr. Demb says, "Normalizing conversations about poop isn't just cute or quirky—it's a serious tool in cancer prevention."Parents, teachers, influencers, and physicians need to all join together in promoting a culture that favors openness regarding gut health. Vocabulary such as "stool" or "rectal bleeding" should not be masked in euphemisms. Millennials, the group that has spearheaded mental health activism and sexual health education, are perfectly placed to help break down this barrier.Millennials are confronted with an unprecedented health threat that calls for urgency, awareness, and action. Early-onset colon cancer is not only a health problem—it's a cultural one, driven by stigma, misinformation, and outdated screening practices.