Ask a health professional: Why are more young adults facing colorectal cancer?
Colorectal cancer (CRC) has traditionally been seen as a condition that primarily affects older adults, but a concerning shift is underway. Cases among adults under 50 are rising sharply, even as overall CRC rates decline in older populations due to increased screening.
It’s a critical time to spotlight this growing health issue and highlight the crucial role of early detection, lifestyle choices and prevention in reducing risk.
A rising trend: What the research shows
Studies indicate that CRC incidence in younger adults has been increasing by approximately 1-2% annually over the past two decades. A 2023 study published in JAMA Network Open reported that CRC is now the second leading cause of cancer-related deaths in individuals under 50 in the United States. The American Cancer Society has also projected that by 2030, CRC will become the leading cause of cancer death in this age group.
This rise has been observed across different racial and ethnic groups, with cases appearing more frequently in younger individuals without traditional risk factors.
Possible causes: Why is CRC affecting younger populations?
While the exact reasons for this increase remain under investigation, several contributing factors have been proposed:
Dietary xhanges: The modern Western diet — high in processed foods and low in fiber — has been associated with gut microbiome alterations that may contribute to earlier cancer development.
Vitamin D deficiency: Research from The British Journal of Cancer suggests that inadequate vitamin D levels may increase CRC risk, as this vitamin plays a role in regulating cell growth and inflammation.
Sedentary lifestyles: Lack of regular physical activity has been linked to obesity, insulin resistance and chronic inflammation, all of which can contribute to colorectal cancer.
Gut microbiome changes: Emerging studies suggest that imbalances in gut bacteria, possibly driven by diet, long-term antibiotic use and other lifestyle factors, may contribute to early-onset CRC.
Environmental and genetic factors: While inherited conditions can contribute in a percentage of cases, most younger adults diagnosed with CRC have no family history, suggesting a complex interplay of genetics and environmental exposures.
Recognizing the symptoms: When to seek medical attention
One major issue with CRC in younger adults is delayed diagnosis due to a lack of awareness and screening. Many patients and health care providers do not immediately suspect cancer, leading to more advanced-stage diagnoses. Symptoms to watch for include:
Persistent changes in bowel habits (diarrhea, constipation or stool narrowing)
Rectal bleeding or blood in the stool
Unexplained abdominal pain or cramping
Unintended weight loss
Chronic fatigue
If these symptoms persist for more than a few weeks, a medical evaluation is crucial. It is so important to communicate with your provider if you notice any of these changes.
Screening and prevention: Taking action
Early detection is key to improving outcomes. Recognizing the increasing risk in younger populations, the U.S. Preventive Services Task Force (USPSTF) lowered the recommended age for routine CRC screening from 50 to 45.
Preventative steps for lowering uour CRC risk:
Increase fiber intake: Aim for at least 25-30 grams of fiber per day from whole foods such as fruits, vegetables, legumes, and whole grains.
Optimize vitamin D levels: Sun exposure, fortified foods and supplementation may help maintain adequate vitamin D levels.
Regular physical activity: At least 150 minutes per week of moderate-intensity exercise is recommended.
Limit processed and red meat consumption: Reducing intake of processed meats like bacon, hot dogs and deli meats has been shown to decrease CRC risk.
Quit smoking and reduce alcohol consumption: Both have been linked to higher CRC risk.
The call to action
Colorectal Cancer Awareness Month serves as a reminder that cancer does not discriminate by age. Increased awareness, improved screening, and proactive lifestyle changes can help curb the rising rates of CRC in younger adults.
If you or someone you know is experiencing persistent gastrointestinal symptoms, advocate for early screening and medical evaluation. The earlier CRC is detected, the higher the chances of successful treatment and survival.
This story was originally published March 11, 2025 at 4:34 PM.
