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

Medical provider consulting with young individual
Recent study shows that rectal bleeding may be a warning sign for colorectal cancer in younger adults. Stock Photo
  • Scientists report that rectal bleeding is a strong sign of young-onset colorectal cancer in adults under 50.
  • Experts advise that younger adults who notice this symptom should undergo a colonoscopy to check for colorectal cancer.
  • Incidence of early onset colorectal cancer in young adults have been increasing for over a decade.

Rectal bleeding is a clear indicator that individuals under 50 may have colorectal cancer, according to a recent research.

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

The scientists arrived at their conclusions after analyzing 443 individuals under 50 who underwent a colonoscopy at a medical center between 2021 and 2023.

Among the participants, nearly 200 were found with early-onset colorectal cancer while the remaining subjects had normal colonoscopy findings.

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

They further stated that 70% of the cancer patients had no genetic background of the disease.

Furthermore, people who had used tobacco in the past were more than two times as prone to develop early onset colorectal cancer as people who were non-smokers.

The scientific research was presented this week at a major medical conference. The results have yet to be released in a scientific publication.

Bleeding from the Rectum Could Signal Bowel Cancer

The scientists stated that their study demonstrates that individuals under 50 as well as medical professionals should consider rectal bleeding as a important indicator of colorectal cancer.

“A large number of the early-onset colorectal cancers that I encounter have no family history,” said a colorectal surgeon and lead researcher of the study. “This research adds weight to the question 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 interviewed who were not involved in the study agreed with this assessment.

“Young people with rectal bleeding should get a colonoscopy,” advised a professor of medical oncology. “The most difficult message to get across is that colorectal cancer is a condition of young people.”

Another cancer surgeon said that medical professionals should not presume that rectal bleeding in individuals under 50 is caused by hemorrhoids.

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

A leading expert of cancer screening research at a major cancer organization concurs.

“Doctors often minimize signs of colorectal cancer in individuals under 50, thinking that the chances of the symptoms being caused by colorectal cancer are unlikely because the patient is too young,” the expert noted. “The study results are not surprising. Persistent rectal bleeding is abnormal and the source should be immediately examined.”

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

“Pay attention to any symptoms,” he said. “This research delivers this warning a bit more strongly.”

Colorectal Cancer Cases Increasing in Young Adults

A major cancer organization projects there will be over 150,000 new cases of colorectal cancer diagnosed in the United States this year.

Over one hundred thousand of those cases will be colon cancer, while just under 50,000 will be rectum cancer.

The cases are split almost evenly between men and women.

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

The cancer organization reports that the incidence of people being diagnosed with colorectal cancer in the United States has been decreasing approximately one percent per year since the 1980s. They credit early screening and changes in lifestyle habits.

However, they point out that the decrease is primarily occurring in individuals over 50. 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 decreasing slightly in the overall population, but it has been increasing somewhat in individuals under 50.

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 approximately 1990 have twice the risk of colorectal cancer relative to people born approximately 1950.

“These risks are increasing and are carried forward as people get older, meaning we see more diagnoses of colorectal cancer before and after age 45,” he said.

Medical professionals are unsure what is driving the increase in early onset colorectal cancer, but diet, sedentary lifestyle, and excess weight are among the suspected factors.

Another specialist said there are also some theories that the excessive use of antibiotics as well as swelling in the body may be contributing to drive up colorectal cancer rates.

Furthermore, there has also been some study indicating that gut microbes may additionally play a role.

One specialist suggested that exposure to this kind of bacteria as a child may cause colorectal cancer to develop twenty to thirty years down the road.

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

Why Colorectal Cancer Tests Are Important

Healthcare professionals state that colorectal cancer is curable if caught in its early stages. In later stages, it can be fatal.

They emphasize that’s why examinations are crucial.

Present recommendations suggest men and women to begin being tested for colorectal cancer at age 45.

Furthermore, screenings may be necessary prior to age 45 if a individual has a family history of colorectal cancer or has specific health issues such as inflammatory bowel disease (IBD).

It’s recommended that colonoscopy examinations be done every 10 years for people with no family history of the disease and no growths discovered during the procedure. The interval between tests can be shorter for different patients.

Colonoscopies are generally considered the most effective screening for colorectal cancer, but other tests, such as at-home stool kits, can additionally be used.

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

  • change in bowel habits
  • diarrhea
  • constipation
  • pain or stomach pain
  • unexpected weight loss

An specialist 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 talked about with their doctor, especially if relatives were found at a young age,” he advised.

Ways to Lower Your Risk of Colorectal Cancer

There are a variety of ways a individual can lower their risk of colorectal cancer. Among them:

  • Healthy diet: Diets high in unhealthy fats and low in fiber are linked with an higher risk of colorectal cancer. Beef and processed foods have been shown to increase the risk. Protein from poultry, seafood, and beans is considered a healthier option. High-fiber foods, including fruits, vegetables, and grains, may lower the risk of colorectal cancer.
  • Regular exercise: A leading health institute recommends two and a half hours of moderate exercise a week. {Regular|Consistent
Jared Williams
Jared Williams

Elara is a seasoned software engineer and tech writer, passionate about demystifying complex technologies and sharing actionable advice.