Bleeding from the Rectum in Young Adults Linked to 8.5 Times Higher Risk of Colorectal Cancer

Healthcare provider speaking with young individual
Recent study shows that rectal bleeding may be a red flag for colorectal cancer in younger adults. Getty Images
  • Researchers say that rectal bleeding is a significant sign of early onset colorectal cancer in adults below 50.
  • Experts advise that individuals under 50 who notice this symptom should undergo a colonoscopy to screen for colorectal cancer.
  • Rates of young-onset colorectal cancer in young adults have been increasing for more than a ten years.

Bleeding from the rectum is a telltale sign that individuals under 50 could have colorectal cancer, according to a new study.

Scientists found that rectal bleeding in younger adults increases the odds of a colorectal cancer identification by a factor of 8.5.

The researchers arrived at their conclusions after examining 443 patients below 50 who underwent a colonoscopy at a university health system between 2021 and 2023.

Of the participants, nearly 200 were diagnosed with young-onset colorectal cancer while 248 subjects had clear colonoscopy results.

The scientists said that 88% of the younger individuals with cancer had a colonoscopy because of signs, not because of routine screenings.

They added that a significant percentage of the cancer patients had no family history of the condition.

Furthermore, people who had smoked in the past were over two times as likely to develop early onset colorectal cancer as people who were non-smokers.

The researchers’ research was shared this week at a professional gathering. The results have yet to be released in a peer-reviewed journal.

Bleeding from the Rectum May Indicate Colorectal Cancer

The scientists said that their research shows that individuals under 50 as well as healthcare providers should consider rectal bleeding as a significant indicator of colorectal cancer.

“Many of the young-onset colorectal cancers that I see have no genetic predisposition,” commented a specialist and senior author of the study. “This study lends support to the issue of who should or shouldn’t require a colonoscopy: if you have a individual under the recommended age with rectal bleeding, you should seriously consider a colonoscopy.”

Experts consulted who were independent in the study concurred with this assessment.

“Younger individuals with rectal bleeding should undergo a colonoscopy,” said a professor of medical oncology. “The most difficult message to communicate is that colorectal cancer is a disease of younger individuals.”

Another surgical oncologist said that medical professionals should not presume that rectal bleeding in younger adults is caused by hemorrhoids.

“Colorectal cancer is a younger individual’s condition,” he said. “We can not take for granted signs such as rectal bleeding in young adults.”

A leading expert of early cancer detection research at a major cancer organization agrees.

“Physicians often minimize symptoms of colorectal cancer in individuals under 50, thinking that the probability of the signs being caused by colorectal cancer are remote because the individual is too young,” the expert noted. “The study results are expected. Ongoing rectal bleeding is not normal and the cause should be immediately examined.”

A medical oncologist said that the study is an important reminder to people under the age of 50.

“Pay attention to any signs,” he advised. “This study sends this message a little louder.”

Colorectal Cancer Cases Rising in Younger Individuals

A major cancer organization projects there will be over one hundred fifty thousand new cases of colorectal cancer diagnosed in the United States this year.

Over one hundred thousand of those instances will be large intestine cancer, while just under 50,000 will be rectal cancer.

The cases are divided almost evenly between males and women.

Colorectal cancer is the third-leading cause of cancer deaths in males and the fourth primary reason in females in the United States. It’s the second most frequent most common cause of cancer fatalities in total. Colorectal cancer is projected to cause about 53,000 deaths this year.

The institute states that the incidence of people being found with colorectal cancer in the United States has been decreasing approximately one percent per year since the mid-1980s. They attribute timely testing and improvements in daily routines.

Nevertheless, they point out that the decrease is primarily occurring in older adults. In people under 50, the incidence of colorectal cancer diagnosis increased over two percent per year between 2012 and 2021.

The death rate from colorectal cancer has additionally been decreasing moderately in the general public, but it has been rising slightly 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 specialist noted that people born approximately 1990 have double the likelihood of colorectal cancer relative to people born approximately 1950.

“These dangers are increasing and are persisting as people get older, meaning we see an increasing number of cases of colorectal cancer before and after age 45,” he said.

Medical professionals aren’t certain what is driving the increase in young-onset colorectal cancer, but nutrition, lack of physical activity, and excess weight are among the suspected causes.

Another specialist mentioned there are additionally some theories that the overuse of medications as well as inflammation in the body may be helping increase colorectal cancer incidence.

In addition, there has also been some research indicating that gut microbes may also play a role.

One expert said that exposure to this type of bacteria as a child may cause colorectal cancer to develop twenty to thirty years down the road.

“We’re still working to understand everything out,” he commented.

Why Colorectal Cancer Tests Matter

Healthcare professionals say that colorectal cancer is curable if detected in its early stages. In later stages, it can be deadly.

They say that’s why examinations are vital.

Present guidelines suggest males and females to begin being tested for colorectal cancer at age 45.

Furthermore, screenings may be required before age 45 if a individual has a family history of colorectal cancer or has certain medical conditions such as bowel inflammation.

It’s advised that colonoscopy examinations be done every 10 years for people with no genetic risk of the condition and no polyps found during the exam. The time between tests can be shorter for different patients.

Colon examinations are typically regarded as the best test for colorectal cancer, but alternative methods, such as at-home stool kits, can additionally be used.

In addition to rectal bleeding, other signs of colorectal cancer include:

  • alteration of bowel habits
  • diarrhea
  • constipation
  • pain or stomach pain
  • unexpected weight loss

An specialist notes that genetic background should not be ignored.

“People should be aware of their genetic background of cancer and any identification of colorectal cancer among family members should be discussed with their physician, particularly if relatives were found at a early age,” he said.

How to Lower Your Risk of Colorectal Cancer

There are a number of ways a individual can lower their risk of colorectal cancer. These include:

  • Healthy diet: Eating patterns rich in fat and deficient in dietary fiber are linked with an higher chance of colorectal cancer. Red and processed meats have been shown to increase the risk. Nutrition from poultry, fish, and beans is regarded as a better choice. High-fiber foods, such as fruits, vegetables, and cereals, may decrease the probability of colorectal cancer.
  • Regular exercise: A leading cancer research organization recommends two and a half hours of moderate physical activity a week. {Regular|Consistent
Brandy Wright
Brandy Wright

Lena is a tech journalist with over a decade of experience covering consumer electronics and emerging technologies.