Constipation starts in the classroom

Ask an adult with lifelong constipation when it began and most can't tell you. They'll say it's just how they've always been. Slow. Blocked up. Two or three times a week if they're lucky.

Push a little harder and a pattern shows up again and again.

It started at school.

Not because of what they ate. Because of what they weren't allowed to do.

Half of primary school kids are holding it in

A study of 1,000 Dutch children aged 8 to 16 found that 51.2% of primary school children and 71.4% of high school students had deliberately held in a bowel movement during school hours. The reasons they gave were hygiene, privacy and taboo. Half of them reported abdominal pain. Only 12.5% had ever mentioned it to a doctor.

Read that again.

Seven in ten teenagers are holding on until they get home, half of them are in pain because of it, and almost none of them are telling anyone.

A German study of primary schools found the same split. Around three quarters of parents said their child would happily use the school toilet to wee. Only a third said their child would use it to poo. Nearly half said their child deliberately retained stool to avoid the school toilet altogether.

A separate cohort study of primary school children put the number at 63% avoiding defecating at school. A third of the kids said the toilets were dirty or very dirty.

These aren't fringe numbers. This is most children, most days, for thirteen years.

The body has terrible timing, and school has worse policy

Here's the part that makes the whole thing so avoidable.

The urge to go usually arrives 20 to 30 minutes after eating. For a child at school, that lands squarely in the middle of the lesson right after lunch. Exactly when a hand goes up and a teacher says the six words that shape a generation of bowels:

You should have gone at lunch.

Except lunch was a queue. Or a club. Or a choice between eating and going, and they chose eating. Or they walked into a cubicle with no door lock, no toilet paper, no soap, and a group of kids waiting outside, and decided their body could wait.

So they hold on. And the moment passes.

This isn't a hypothetical. In 2025 parents from multiple NSW high schools came forward describing locked toilet blocks, students having to explain in front of the class why they needed to go, teachers banging on cubicle doors, permission refused outright, and children soiling themselves in class. Some students stopped coming to school entirely.

Continence Health Australia has been saying it plainly for years. If children ignore the urge to go, or are not allowed to leave the classroom, the result can be constipation and faecal soiling. Their School Toilet Charter starts with one line that shouldn't need writing down: students should be allowed to go to the toilet when they need to go.

What holding on actually does

This is where a school rule becomes a medical condition.

When stool sits in the bowel longer than it should, the body keeps pulling water out of it. The longer it waits, the harder and drier it gets. When the child finally does go, it hurts.

And a child who has been hurt by a poo will do anything to avoid the next one.

That's the loop researchers describe as the mechanism behind functional constipation. Refuse the painful bowel movement, hold it back, the stool hardens, the bowel stretches, the next one hurts more, so hold on longer. Round and round, quietly, for years.

The bowel wall stretches to accommodate what's sitting in it. The signal that says go now gets weaker. Eventually the child stops feeling the urge at all, which parents often mistake for the problem resolving itself.

Then come the flow-on effects. Faecal soiling, which gets read as laziness or naughtiness. Daytime wetting. Urinary tract infections. Abdominal pain that gets written off as an excuse to go home.

And the workaround kids invent themselves is worse than the problem. Surveys consistently find children who stop eating and drinking at school so they won't need the toilet. One in ten teachers in a UK survey had witnessed it directly, and 13% of those said the child became unwell as a result.

A child who is dehydrated and under-fed all day, holding in a bowel movement for six hours, is being set up for exactly the outcome we then blame on their diet.

It ends up costing all of us

In Victoria alone, paediatric constipation costs public hospitals around A$5.5 million a year. Hospitalisation rates for constipation in Victorian children run roughly ten times higher than in the USA, with 10% of children readmitted within a month of going home.

Those are the kids who ended up in an emergency department for something that started with a locked toilet block and a teacher saying no.

What actually helps

If you're a parent: ask the specific question, not the general one. Not "how was school", but "did you go to the toilet at school today?" If the answer has been no for weeks, that's information. Look at what's happening on weekends and school holidays too. A child who goes fine on a Saturday and never on a Tuesday doesn't have a diet problem.

Ask the school directly what their toilet access policy is during class. You are allowed to ask this. If the answer involves passes, quotas, or naming and shaming frequent users, that is a policy worth pushing back on.

If you're a teacher or you're on a P&C: Continence Health Australia's Toilet Tactics program is free, Australian, and built exactly for this. It covers the toilet charter, facility standards and classroom practice. Clean cubicles with doors that lock, adequate toilet paper and soap, and permission to go when the urge arrives. It is not a big ask and it changes the trajectory of a child's gut health for decades.

If you're an adult who reads all of this with a sinking feeling of recognition: that pattern was learned, and learned patterns can be unlearned. Sitting when the urge comes, unhurried, feet supported, without a phone and without a deadline is not a small thing. For a lot of people it's the whole thing.

The bit nobody wants to say out loud

We have made pooing shameful, and then we built the shame into the school day.

Kids don't need a lecture about fibre. They need a clean toilet with a door that locks, and an adult who says yes when they ask to go.

Everything else follows from that.