We have known for some time that early-life stress can play a role in how children learn and develop. Think of effects on attention, memory, and emotion regulation. By now, that is fairly well established. New research again suggests that this same early stress is also associated with something that at first sight seems more distant: gastrointestinal problems, sometimes years later. Does early life stress lead to abdominal pain and worse later on?

A recent study in Gastroenterology examines that link in quite some detail. No, it is not a journal I normally follow, but the press release appeared in my RSS feed. Sarah A. Najjar, together with a very long list of co-authors, combines research in mice with large population studies in children. The result is an interesting but at the same time complex picture. It could have been simple…

In mice, the effects are quite clear. When researchers expose young animals to stress (for example through temporary separation from their mother), the development of their gut changes. Later, these animals show increased abdominal pain sensitivity and altered gut motility. Researchers link these effects to changes in the enteric nervous system itself and to shifts in how the brain and gut communicate. Up to that point, the story feels familiar: stress leaves traces in the body, with clear indications of a causal relationship.

The picture becomes more interesting when researchers place these findings alongside human data. In large cohort studies, children of mothers with, for example, depressive symptoms during or after pregnancy show a higher likelihood of what are called “disorders of gut–brain interaction”. These include conditions such as irritable bowel syndrome, abdominal pain, or functional constipation. The increases in risk are not dramatic, but they do appear consistently.

But… this type of research does not offer a simple cause-and-effect story. It does not show that “stress causes gut problems”. Instead, it reveals associations. Correlations. And those can have multiple explanations.

Biological stress may indeed shape gut development. That is plausible, especially given what we know about the so-called gut–brain axis. But other factors likely play a role as well: genetic vulnerability, environment, nutrition, socio-economic conditions, parent–child interactions… Researchers rarely manage to fully disentangle these kinds of complex entanglements. The authors themselves are explicit about this. The human data remain observational and, by definition, cannot establish causality.

What we can take away, then, is not that stress “damages your gut”, but that early experiences may have broader effects than we sometimes assume. Not only on behaviour or learning, but possibly also on bodily systems that we do not immediately associate with them. This fits a broader pattern in research. Time and again, development turns out not to be the sum of separate domains. Cognition, emotion, physiology: they constantly influence one another.

For education, this does not mean that teachers suddenly need to solve gastrointestinal problems. But it does once again underline how important a stable, safe environment is. Not only because children feel better in it, but also because that context may influence how different systems develop.