The incidence of colorectal cancer, historically associated with older adults, is rising among younger individuals—currently, approximately 1 in 5 cases are diagnosed in people under the age of 54. This concerning trend has prompted surgeons to emphasize the importance of recognizing potential symptoms early. The American College of Surgeons (ACS) recently disseminated a list of symptoms that should not be ignored, aiming to promote early detection and reduce mortality rates associated with this increasingly prevalent cancer.
According to the American Cancer Society, nearly 1 in 25 men and women will develop colorectal cancer during their lifetime. While the disease remains more common in older adults, rates have been increasing in those under 50 in recent decades, now representing the leading cause of cancer death in this age group. Recognizing the subtle signs of colorectal cancer can be life-saving, particularly as symptoms are often initially attributed to less serious conditions.
The Importance of Early Detection
To encourage proactive conversations with primary care physicians, the American College of Surgeons has made educational materials and a checklist of warning signs freely available. The goal is to empower patients to recognize potential symptoms and seek medical evaluation without delay. Early detection significantly improves treatment outcomes and survival rates.
“Often, when younger patients seek medical attention for intestinal symptoms, these are attributed to hemorrhoids or constipation and treated conservatively,” explains Marylise Boutros, a colorectal surgeon at Cleveland Clinic Florida and a member of the ACS Patient Education Committee. “With the growing number of young people being diagnosed with colorectal cancer, knowing the subtle signs and symptoms of the disease can save lives.”
Four Key Symptoms to Watch For
Paula Denoya, state chair of the Commission on Cancer (CoC) in eastern Long Island-New York and a colorectal surgeon at Stony Brook University Hospital, emphasizes that “any new or different bowel change requires medical attention” and recommends discussing these symptoms during annual check-ups.
1. Blood in the Stool: The Most Common Sign
The presence of blood in the stool, especially if recurrent, is a significant warning sign. This can manifest as bright red blood on toilet paper or in the toilet bowl, or as dark, tarry stools when blood mixes with fecal matter. A research study presented at the 2025 American College of Surgeons Clinical Congress found that, among patients under 50 undergoing colonoscopy for symptoms, rectal bleeding was the most vital predictive factor for colorectal cancer, increasing the odds by 8.5 times.
“Any recurrent amount of blood should be evaluated, and a colonoscopy may be indicated to determine the underlying cause,” says James T. McCormick, state chair of the Pennsylvania section of the CoC and chief of the Colorectal Cancer Program at Allegheny Health Network.
2. Changes in Bowel Habits
Beyond visible blood, alterations in stool appearance—including bright red, dark, or tarry stools—as well as the presence of mucus, can indicate bleeding in the gastrointestinal tract, colon, or rectum. These changes also warrant medical evaluation. Persistent diarrhea or constipation, or a change in the consistency of stool, should also be discussed with a doctor.
3. Unexplained Weight Loss and General Health Changes
Other signs that may accompany colorectal cancer include unexplained weight loss, fatigue, weakness, loss of appetite, nausea, or vomiting. While these symptoms can be associated with various conditions, their persistence should prompt a medical consultation. These systemic symptoms often indicate the cancer has progressed and is impacting overall health.
Pay attention to these symptoms. Photo:iStock
4. Family History and Screening
Routine screening tests are recommended starting at age 45. However, individuals with a family history of colorectal cancer or inflammatory bowel diseases, such as Crohn’s disease or ulcerative colitis, may need to commence screening earlier. The American Cancer Society and the Colorectal Cancer Alliance are currently promoting the “Your Colon is 45” initiative to raise awareness about the importance of screening for those over 45.
A colonoscopy is considered the gold standard for detection, as it allows for the identification of cancer and the removal of precancerous polyps during the same procedure.
“Colorectal cancer is highly treatable when detected early, and advances in surgical techniques continue to make treatment less invasive,” Boutros concludes.
Disclaimer: This article provides general medical information and should not be considered a substitute for professional medical advice. Always consult with a qualified healthcare provider for diagnosis and treatment of any medical condition.
The increasing rates of colorectal cancer, particularly in younger adults, underscore the importance of vigilance and proactive healthcare. The American Cancer Society continues to refine its screening guidelines, and ongoing research aims to improve early detection methods and treatment options. Individuals concerned about their risk should discuss their personal and family history with their doctor to determine the most appropriate screening schedule.
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