Colon Cancer Now Top Killer of Americans Under 50

A Deadly Shift in Young Adult Cancer

A startling reversal has emerged in cancer mortality among Americans under 50. Colorectal cancer is now the leading cause of cancer deaths among people younger than 50 in the United States, according to a study published Thursday in the Journal of the American Medical Association. Colorectal cancer death rates in that age group climbed by 1% every year since 2005 , while overall cancer death rates in people younger than 50 have dropped by 44% since 1990 .

It claimed that spot seven years sooner than expected, in 2023, the new study found . In 1990, colorectal cancer was the fifth-leading cause of cancer deaths in all people younger than 50. By 2023, it was the first . This dramatic rise stands in sharp contrast to other cancers: lung cancer deaths in the group fell from first to fourth overall, declining by nearly 6% annually from 2014 to 2023 .

Since 1994, colorectal cancer incidence has increased 51% in people younger than 50, climbing about 3% per year since 2011 in those aged 20 to 49 . What makes this trend particularly concerning is that about three fourths, maybe 60 to 70 percent, of the time, people [under age 50] have more advanced disease when diagnosed.

The Mystery Behind Rising Cases

Experts remain puzzled by the underlying causes driving this epidemic among younger adults. "What's alarming is that we don't know what's causing it," said Kupfer, director of UChicago Medicine's Gastrointestinal Cancer Risk and Prevention Clinic . "When we look at this epidemiologically, the increase is almost certainly due to environmental causes," Reeves says. "We're seeing a huge rise in obesity, sedentary lifestyles, and consumption of processed foods and red meat" .

The disease increasingly affects people who don't fit traditional risk profiles. Many younger patients diagnosed with colorectal cancer do not have typical risk factors like family history . Adults 65 and younger comprise nearly half (45%) of all new cases — a significant increase from 27% in 1995, according to a report from the American Cancer Society. "Once considered a disease that primarily affected people over 50, we are now seeing increasing diagnoses in patients in their 20s, 30s and 40s" .

Critical Screening Guidelines and Warning Signs

The U.S. Preventive Services Task Force recommends universal screening starting at age 45 and earlier for people who are high-risk . "Colon cancer is a life-threatening disease, but it's a highly curable form of cancer and has a 90% survival rate when detected early," said Dr. Nathan Merriman, MD, medical director for gastroenterology and digestive health at Intermountain Health .

However, screening rates remain disappointingly low. Only about 20% of people aged 44–49, who are universally eligible for colorectal cancer screening, are up to date, according to the American Cancer Society . According to experts, the data shows that a third of people who could get checked for colon cancer don't. A missed or delayed screening gives colon cancer a chance to grow and become more dangerous, long before any symptoms might appear .

Young adults should watch for warning signs including blood in the stool, persistent constipation, or unexplained weight loss . "The best advice we can give is to not ignore any symptoms. If you notice blood in your stool, don't just assume it's hemorrhoids — talk to your doctor" .

Hope Through Early Detection and Prevention

A colonoscopy is the gold standard of screening for colon cancer because if pre-cancerous polyps are identified, they can be removed easily during the screening colonoscopy . For those hesitant about colonoscopies, at-home tests like Cologuard are highly effective and far better than doing nothing at all , though any positive result requires a follow-up colonoscopy .

Prevention strategies extend beyond screening. Exercise regularly: aim for 150 minutes per week. Don't use tobacco products. Limit alcoholic beverages . Simple dietary changes like limiting red meat and processed meat and avoiding ultra-processed foods can also reduce risk.

The medical community is responding with innovation and urgency. UChicago Medicine is part of a study using artificial intelligence to enhance polyp detection during the procedure , while researchers explore whether intervent