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- By Matthew Mcguire
- 11 Mar 2026
Rectal bleeding is a telltale sign that young adults could have colorectal cancer, according to a new study.
Scientists reported that rectal bleeding in younger adults increases the likelihood of a colorectal cancer identification by a factor of 8.5.
The researchers arrived at their findings after examining 443 patients under 50 who had a colonoscopy at a medical center between 2021 and 2023.
Among the participants, 195 were diagnosed with young-onset colorectal cancer while the remaining subjects had clear colonoscopy results.
The scientists noted that the vast majority of the younger individuals with cancer underwent a colonoscopy because of signs, not because of routine screenings.
They further stated that 70% of the cancer patients had no family history of the disease.
Furthermore, people who had used tobacco in the past were more than two times as prone to develop young-onset colorectal cancer as people who hadn’t smoked.
The scientific research was shared this week at a professional gathering. The findings have not been published in a peer-reviewed journal.
The scientists stated that their research shows that individuals under 50 as well as medical professionals should take rectal bleeding as a important indicator of colorectal cancer.
“Many of the early-onset colorectal cancers that I see have no genetic predisposition,” said a colorectal surgeon and senior author of the research. “This study lends support to the question of who should or shouldn’t warrant a colonoscopy: if you have a individual under the screening age with rectal bleeding, you should seriously consider a colonoscopy.”
Experts consulted who were not involved in the research concurred with this assessment.
“Young people with rectal bleeding should get a colonoscopy,” advised a cancer specialist. “The hardest point to get across is that colorectal cancer is a condition of young people.”
Another surgical oncologist said that medical professionals should not assume that rectal bleeding in younger adults is caused by piles.
“Colorectal cancer is a young person’s disease,” he said. “We can no longer take for granted symptoms such as rectal bleeding in young adults.”
A leading expert of cancer screening science at a national cancer institute concurs.
“Physicians often downplay signs of colorectal cancer in individuals under 50, believing that the chances of the symptoms being caused by colorectal cancer are unlikely because the individual is too young,” the expert noted. “The study results are expected. Persistent rectal bleeding is not normal and the cause should be promptly investigated.”
A medical oncologist commented that the research is an important reminder to people under the age of 50.
“Don’t ignore any symptoms,” he said. “This research delivers this message a little louder.”
A major cancer organization estimates there will be more than 150,000 diagnoses of colorectal cancer diagnosed in the United States this year.
Over one hundred thousand of those instances will be colon cancer, while slightly less than fifty thousand will be rectum cancer.
The cases are divided roughly equally between men and females.
Colorectal cancer is the third most common cause of cancer-related deaths in men and the fourth most common primary reason in women in the United States. It’s the second most frequent prevalent cause of cancer deaths in total. Colorectal cancer is expected to cause about fifty-three thousand deaths this year.
The institute states that the incidence of people being found with colorectal cancer in the United States has been decreasing approximately 1% per year since the 1980s. They credit timely testing and improvements in daily routines.
However, they point out that the decrease is mostly occurring in older adults. In people under 50, the incidence of colorectal cancer diagnosis increased more than 2% per year between 2012 and 2021.
The death rate from colorectal cancer has also been declining moderately in the general public, but it has been increasing somewhat in younger adults.
Actually, colon cancer is the primary reason of cancer-related death in adults ages 20 to 49 in the United States.
An expert noted that people born around 1990 have twice the risk of colorectal cancer compared with people born around 1950.
“These risks are continuing to rise and are persisting as people get older, meaning we observe more diagnoses of colorectal cancer both below and above age 45,” he said.
Doctors aren’t certain what is causing the rise in early onset colorectal cancer, but diet, sedentary lifestyle, and excess weight are among the possible causes.
Another specialist said there are additionally some ideas that the excessive use of medications as well as inflammation in the body may be helping increase colorectal cancer rates.
Furthermore, there has additionally been some research indicating that gut microbes may additionally be involved.
One expert said that exposure to this type of microbes as a child may cause colorectal cancer to develop twenty to thirty years later.
“We’re still trying to figure everything out,” he said.
Healthcare professionals state that colorectal cancer is curable if caught in its early stages. In advanced phases, it can be deadly.
They say that’s why examinations are vital.
Present guidelines suggest men and women to begin being screened for colorectal cancer at age forty-five.
In addition, tests may be necessary before age 45 if a individual has a family history of colorectal cancer or has specific medical conditions such as bowel inflammation.
It’s advised that colonoscopy examinations be done every 10 years for people with no family history of the condition and no growths discovered during the exam. The time between tests can be shorter for other patients.
Colon examinations are typically considered the most effective test for colorectal cancer, but other tests, such as home test kits, can also be used.
Besides rectal bleeding, other signs of colorectal cancer include:
An expert adds that genetic background should never be ignored.
“Individuals should know their genetic background of cancer and any diagnosis of colorectal cancer among family members should be discussed with their doctor, particularly if family members were diagnosed at a early age,” he said.
There are a number of ways a person can lower their risk of colorectal cancer. Among them:
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