When you already have a lot to discuss about ADHD, bringing up constipation, bloating or bowel changes might feel like one more awkward thing. But those symptoms deserve attention too.
The question “Why do these things seem to happen together?” is a reasonable one. I want to explore it without jumping from a connection to a promised cure.
What did the researchers find?
A review published on 10 September 2026 brought together 23 studies that observed people’s health rather than assigning them a treatment. It found a connection between ADHD and digestive problems, including constipation and irritable bowel syndrome, usually called IBS. The studies included children and adults, rather than women alone. [1]
That does not mean everyone with ADHD will have gut symptoms, or that ADHD explains a particular person’s pain.
The “why” is still open
Most studies did not separate people according to whether they took ADHD medicine. That makes it harder to untangle medicine effects from other explanations. The studies also differed, and the researchers had limited ways to judge whether some findings were more likely to be published than others. [1]
Putting studies together can make a pattern easier to see. It does not turn the pattern into proof of cause and effect.
So this review does not show that a diet, probiotic, supplement or peptide treats ADHD through the gut. “Heal your gut to cure ADHD” is a much bigger claim than this evidence supports.
Your symptoms still deserve their own attention
I would not want someone’s digestive symptoms waved away as “just part of ADHD”. Healthdirect recommends seeing a doctor about IBS-type symptoms so other causes can be considered. Severe or persistent symptoms, blood in the stool, unexplained weight loss, fever or severe diarrhoea particularly need assessment. [2]
A few notes can help
You could jot down what happens, when it began, how often it occurs and what it interrupts. Include medicines and supplements, recent changes, and any pattern around meals or your period.
Healthdirect notes that IBS symptoms can worsen around menstruation. [2] That is useful to mention, not proof of a hormonal explanation for every symptom.
There is no need for a perfect diary. A few examples are enough to begin explaining what you want help with.
Both questions matter
“What helps my ADHD?” and “What helps these gut symptoms?” can sit beside each other. Feeling better in one area may make daily life easier. Proving that a treatment also works for another condition still needs its own evidence.
Read the original sources
- Blake, Cannon and Shantikumar: ADHD and gastrointestinal symptoms ↗Journal of Attention Disorders · 10 September 2026 · Peer-reviewed systematic review and meta-analysis of observational studies. DOI: 10.1177/10870547261469626. Methods, findings and limitations reviewed.
- Healthdirect: IBS symptoms and when to seek assessment ↗Australian patient guidance · Used for symptom assessment and menstrual-cycle context, not as evidence for an ADHD treatment.