Colorectal cancer is usually thought of as a disease of middle and older age. A new study presented this week at the American Academy of Pediatrics (AAP) 2026 National Conference in San Diego is a reminder that it can show up much earlier, and that it is often caught late when it does.
What the researchers found
The team, part of the Pediatric Surgical Oncology Research Collaborative, reviewed the medical records of 84 patients age 21 or younger who were diagnosed with colorectal cancer between 2012 and 2023.
- Only about 20% had a parent, sibling, grandparent or other first- or second-degree relative with colorectal cancer.
- Most already had Stage III or IV disease when they were diagnosed.
- More than one-third saw the cancer come back.
- Nearly half died from the disease.
Study author Dr. Erica Arnold said colorectal cancer is becoming more common in adolescents and young adults and tends to be aggressive in this age group, often appearing at a late stage.
Symptoms worth taking seriously
The researchers point to lower back pain, abdominal pain, changes in bowel habits, weight loss and rectal bleeding. Because the disease is rare in young people, these signs can be blamed on something else.
The American Cancer Society’s list for all ages is similar: a change in bowel habits that lasts more than a few days, bright red rectal bleeding, dark or black stool, cramping or belly pain, weakness and fatigue, and unintended weight loss. Most of these have more common causes, such as hemorrhoids or an infection, which is exactly why a doctor should check them out rather than guess.
The catch
This is a retrospective review of records, not a trial, and 84 patients is a small group. It describes what happened to young people who were diagnosed; it can’t tell us how common the disease is, why it occurs or how many cases were missed. Research presented at a conference is generally considered preliminary until it has been published in a peer-reviewed journal.
What it means for screening
Routine screening still isn’t recommended for teenagers. The U.S. Preventive Services Task Force recommends that adults at average risk start colorectal cancer screening at age 45. That advice is for people at average risk; if colorectal cancer runs in your family, ask your doctor whether you should start sooner.
The practical message for everyone else is simpler: persistent bleeding or bowel changes are not something to wait out, at any age.
This article is for general information, not medical advice.
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