Colorectal Cancer Rates Rise Among Young Adults, Experts Cite Lifestyle Factors

In recent years, colorectal cancer has become increasingly common among younger adults aged 30 to 40, while incidence rates in those over 65 have declined. This trend is particularly notable for rectal cancer, which affects the final section of the large intestine near the anus. Although colorectal cancer is often grouped together, rectal cancer can present somewhat different symptoms.

Gastroenterologists and oncologists highlight rectal bleeding or blood in the stool as the most common symptom, which can appear as bright red or dark blood on toilet paper, in the toilet bowl, or mixed with stool. Other warning signs include persistent abdominal pain, changes in bowel habits, prolonged constipation, thinner stools, unexplained fatigue, weight loss, and iron deficiency anemia. Medical professionals stress that any new and persistent digestive changes, especially blood in the stool, require prompt medical evaluation.

Researchers believe the rise in young adults is linked to environmental and lifestyle factors rather than improved detection alone. Risk factors include obesity, diabetes, a Western diet high in red and processed meats, sugars, and refined carbohydrates, low intake of fruits, vegetables, and fiber, alterations in gut microbiota, and possibly exposure to microplastics, though this is still under investigation.

To reduce risk, experts recommend colorectal cancer screening starting at age 45 for average-risk individuals and earlier for those with a family history. They also advise adopting a Mediterranean diet rich in vegetables, fruits, legumes, and whole grains, limiting red and processed meat consumption, avoiding sugary drinks, reducing alcohol intake, maintaining a healthy weight, and engaging in regular physical activity. Immediate medical consultation is urged for any bleeding or persistent bowel changes.

Doctors caution that while most cases of bleeding or abdominal pain are not cancer, ignoring these symptoms is dangerous given the rising incidence among younger populations. Early diagnosis significantly improves treatment outcomes.