Rising Cases of Early-Onset Colorectal Cancer

In recent years, more young people are being diagnosed with early-onset colorectal cancer. Researchers are investigating the causes behind this alarming trend. Studies reveal that individuals under 50 are most affected. Experts believe the rise stems from changes in environmental, lifestyle, or genetic factors.

Who Is Most at Risk?

Those born in the latter half of the 20th century face the highest risks. According to the American Cancer Society, colorectal cancer begins in the colon. “Most colorectal cancers start as a growth on the inner lining of the colon or rectum. These growths, called polyps, can sometimes turn cancerous over time.”

Historically, colorectal cancer primarily affected older adults. However, the increasing number of young patients has led researchers to rethink screening guidelines and explore new treatments.

Symptoms Often Go Unnoticed

Dr. Jeremy Kortmansky from Yale School of Medicine highlights that colorectal cancer often exhibits aggressive traits, leading to late-stage diagnoses. Common symptoms include rectal bleeding, bowel habit changes, diarrhea, or constipation. Many dismiss these signs, mistaking them for conditions like hemorrhoids or irritable bowel syndrome.

Lifestyle Changes and Their Impact

Rebecca Siegel from the American Cancer Society suggests that lifestyle changes introduced in the mid-20th century could be driving the rise in early-onset cases. The Western diet has shifted dramatically, with more processed foods and sugars, including high-fructose corn syrup, becoming staples in the 1970s. Researchers link these dietary changes to obesity and metabolic disorders, both risk factors for colorectal cancer.

Sedentary Lifestyles and Delayed Effects

A sedentary lifestyle is another significant risk factor. Studies show that years of unhealthy habits can lead to cancer, explaining the recent surge in cases among younger individuals.

The Role of Genetics and Obesity

Genetics also play a major role in colorectal cancer. Obesity further increases the risk by altering hormones like insulin, which promote cell growth. Chronic inflammation caused by fat tissue worsens this risk. A study in JAMA Oncology found that obesity nearly doubles the likelihood of developing early-onset colorectal cancer.