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A sixteen-year-old says their back hurts.
That is the whole clue. No blood. No lump. Just a back that keeps aching, week after week, in a person far too young for anyone to be worried about.
In early October 2026, a group of surgeons presented the largest look yet at what colorectal cancer in teens actually looks like. They pulled records from 34 hospitals. And the striking thing is not how frightening it is. It is how ordinary it looks on the way in.
What the study actually found
The team, led by Dr Erica Arnold, reviewed the files of 84 patients aged 21 or younger diagnosed with colorectal cancer between 2012 and 2023. The median age was 16.5 years. The findings were presented at the American Academy of Pediatrics national conference in San Diego, 2-6 October 2026. (Source.)
Here is the number that got the attention. 51% were already stage III at diagnosis. Another 29% were stage IV. That is roughly four out of five arriving with advanced disease.
By the end of the study period, 45.2% had died of it. Just over a third relapsed, at a median of 11 months.
Those are hard numbers and there is no gentle way to write them. But the useful part of this study is not the fear. It is the shape of what came before the diagnosis.
The symptom almost nobody expects
These were the four most common symptoms among the 84 patients:
- Pain in the abdomen or back — 73.8%
- A change in bowel habits — 45.2%
- Weight loss — 42.9%
- Rectal bleeding — 38.1%
Now read that list again, starting from the bottom.
Bleeding is the sign everyone knows. It is the one in every awareness campaign, the one people watch for. It was the least common of the four. Plain, boring, easy-to-explain-away pain in the belly or the lower back was nearly twice as common.
And back pain in a teenager has a hundred innocent explanations. A heavy bag. Sport. Sitting badly. Growing fast. Almost every single time, one of those is the right answer. That is exactly what makes it such a poor alarm bell. It so rarely means anything that it almost never gets checked.
If you are reading this at night with a symptom circling in your head — yours, or your child’s — the worry is going to want to keep you up. This is the guide for that part of it:
Four out of five had no family history
Of the 84 patients, 20.2% had a first- or second-degree relative who had also had colorectal cancer. Which means close to 80% did not.
It is worth being precise about this one. The study looked at sporadic cases — cancers that are not part of a known inherited syndrome — so a low family-history rate is partly built into who was included in the first place. But it still lands somewhere that matters.
“Does it run in the family?” is one of the first questions asked when anyone is deciding whether a symptom is worth chasing. For four out of five of these patients, the honest answer was no. A no to that question is not reassurance. It is just the absence of one particular piece of information.
Twelve weeks, and the thing the study does not explain
Symptoms had been going on for a median of 12 weeks before diagnosis. The median wait to a colonoscopy was 13 weeks.
Three months, give or take, for half of them. Longer for the other half.
It is tempting to fill in the reason, and the reason you have probably already imagined is the one that gets told most often: they were waved away for being too young. In many individual cases that is almost certainly what happened. But it is worth saying plainly that this study measured the delay, not the cause of it. It counted weeks. It did not record conversations. Some of those weeks are a teenager not mentioning it. Some are a waiting list. Some are a symptom that genuinely did not look like anything yet.
The number is solid. The story behind the number is not in the data, and filling it in would be inventing something. What the delay does tell us is that for half of these patients, a symptom had been quietly running for three months before anybody named it.
That gap between “something is wrong” and “somebody agrees something is wrong” is its own thing, and it is not unique to this disease. It shows up wherever a symptom is easier to doubt than to measure.
What to actually do with this
First, the thing that keeps it in proportion: 84 patients, gathered from 34 hospitals, across 12 years. That is how uncommon this is. And the researchers were clear that the study was not designed to measure whether cases are rising — it was designed to describe what the cases look like. So this is not a reason to panic about a sore back.
It is a reason to know the shape of the thing. Five things that cost nothing:
- Watch the clock, not just the symptom. One sore week is life. The same ache at six, eight, twelve weeks, not shifting and not explained, is a different kind of fact.
- Say the boring symptom out loud. Pain in the belly or lower back. Stools that changed and stayed changed. Weight dropping without trying. Any blood at all. Say all of them in one go, including the ones that feel too small to mention.
- Bring dates. “It hurts sometimes” and “it has hurt most days since the start of July” are heard completely differently. The second one is data. Write it down before you go.
- Go back. If it was checked and it is still there a month later, book again and lead with exactly that: it is still there. That is not an argument with anyone. It is a second data point, and a symptom that persists is genuinely different information from a symptom that appeared once.
- None of this needs money. A written list of symptoms with dates costs nothing and travels anywhere.
And if the tests come back clear, that is good news that still deserves a plan rather than a shrug — normal results are a starting point, not an ending.
A good place to start:
Why Your Mind Won’t Slow Down at Night
A short guide to why worry gets louder the moment the house goes quiet, and the five-step order that settles it. Get the free guide. Free.
The part people read straight past
There is a very old story about a woman who had been ill for twelve years. She had spent everything she had on doctors and had got worse instead of better. In the story she is healed, and that is the part everybody remembers.
The part that is easy to read past is what happens next. She is already well. The thing is done. There is a crowd and it is moving, and the man at the centre of it stops the whole thing — and lets her tell it. All of it, out loud, from the beginning, in front of everyone.
She did not need to be told anything. He already knew. The telling was for her.
Twelve years of not being taken seriously does its own damage, separate from the illness. That story treats that damage as real. Being heard is not a courtesy added on after the healing; it is part of the healing. Which is a strange detail to find in a text that old and still be missing from so many waiting rooms. Whatever you make of where the story came from, it carries an assumption worth borrowing: that the whole account — symptoms, fear, the unedited version — deserves to be heard all the way to the end. God, in that story, is the one who stops everything so it can be.
Where this leaves you
If you are the one with the ache, you are allowed to be boring about it. Say it again. Say it next month. Bring the dates.
And if you are the one being told — a parent, a friend, the person on the other side of the desk — the cheapest useful thing available to you is to let the whole sentence finish.
Most of the time it will be the school bag, or sport, or nothing at all. Most of the time is not the same as always. And the only way anybody ever finds out which one this is, is somebody saying it and somebody else actually listening.
Questions People Ask
Can teenagers get colorectal cancer?
Yes, but it is uncommon. A 2026 study from the Pediatric Surgical Oncology Research Collaborative gathered 84 patients aged 21 or younger diagnosed with colorectal cancer between 2012 and 2023, drawn from 34 institutions. The median age at diagnosis was 16.5 years. The rarity is visible in the study’s own design: it took 34 hospitals and 12 years to assemble 84 cases.
What are the most common symptoms of colorectal cancer in teens?
In that study of 84 patients aged 21 and under, the most common symptom was pain in the abdomen or back, reported by 73.8%. Changes in bowel habits followed at 45.2%, weight loss at 42.9%, and rectal bleeding at 38.1%. Bleeding, the sign most people associate with the disease, was the least common of the four. A symptom that persists for weeks without a clear explanation is the pattern worth raising with a doctor.
How long do symptoms usually last before colorectal cancer is diagnosed in young patients?
In the 2026 study of 84 patients aged 21 and under, symptoms had persisted for a median of 12 weeks before diagnosis, and the median time to colonoscopy was 13 weeks. The study measured the length of that delay but did not record its causes, so it does not establish why the gap existed in any individual case.
Does colorectal cancer in young people always run in the family?
No. In the 2026 study of 84 patients aged 21 and under, only 20.2% had a first- or second-degree relative with colorectal cancer, meaning close to 80% did not. The study examined sporadic cases rather than known inherited cancer syndromes, so that low rate is partly a feature of who was included. Either way, having no family history does not by itself rule out a symptom being worth investigating.
Is colorectal cancer in teenagers becoming more common?
The 2026 study of 84 patients aged 21 and under does not answer that. It was a retrospective review designed to describe how the disease presents in this age group, and the researchers noted it was not built to measure changes in incidence. Separate research has reported rising colorectal cancer rates among adults under 50, but that is a different and much larger age group than the teenagers in this study.
A Question Worth Sitting With
Which do you think fails people more often — not knowing which symptoms matter in the first place, or knowing, saying so, and not being believed? Tell us what you think in the comments.
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Post 1: In a study of 84 colorectal cancer patients aged 21 and under, the most common symptom wasn’t bleeding. It was back and belly pain, 73.8% vs 38.1%. And 4 in 5 had no family history. Worth knowing. https://bgodinspired.com/index.php/health-and-wellness/colorectal-cancer-in-teens/
Post 2: Half of them had symptoms for three months before anyone named it. Not because nobody spoke — because a sore back in a teenager has a hundred innocent explanations, and almost every time one of them is right. Almost. https://bgodinspired.com/index.php/health-and-wellness/colorectal-cancer-in-teens/
Post 3: Reading this changed what I’d say at a doctor’s appointment. Not “it hurts sometimes.” Instead: “it has hurt most days since July.” One of those is a feeling. The other is a fact, and facts get followed up. https://bgodinspired.com/index.php/health-and-wellness/colorectal-cancer-in-teens/
