ADHD and IBS: What’s the Connection? Plus 4 strategies to stop symptoms in their tracks

Written by: Tiluka Bhanderi, BSc RD
Reviewed by: Sophie Claessens, BSc RD

ADHD and IBS: What's the Connection

Living with both ADHD and irritable bowel syndrome (IBS) can feel frustrating and overwhelming but you’re far from alone. New research into the connection between ADHD and IBS is highlighting how closely the gut and brain interact and how neurodiversity can influence our digestive health. In this blog, we’ll look at why ADHD and IBS commonly appear together and how you can manage both with simple, sustainable tips.

ADHD and IBS may seem like very different conditions but they share several biological and behavioural pathways. Understanding the connection between ADHD and IBS starts by looking at the gut–brain axis which is the two-way communication system between your digestive system and your nervous system1. When this communication becomes disrupted through stress, inflammation or neurochemical imbalances,  IBS symptoms can flare up.

People with ADHD often experience a more sensitive stress response, differences in dopamine regulation and challenges with executive function. These factors can all influence digestion, how the gut processes food and how the brain interprets signals from the gut. This explains why studies show a higher prevalence of IBS symptoms in people with ADHD compared to the general population2.

How ADHD can affect gut health

Daily routines can have a significant impact on digestion and this is an area where ADHD traits commonly show up. Irregular eating patterns such as skipping meals and then grazing later on or eating whatever is available during moments of low energy can contribute to IBS symptoms.

Many people with ADHD also eat quickly without realising it, rely on caffeine to boost their focus or rely on convenience foods during busy or overwhelming moments. None of these behaviours are “wrong,” but they can make IBS symptoms more unpredictable. ADHD medication side effects can also play a role causing appetite changes, nausea and altered hunger cues which can disrupt eating patterns.

The gut–brain feedback loop

Stress and emotional regulation can be triggers to IBS symptoms and it’s also an area where many people with ADHD struggle3. Hyperfocus can lead to long stretches without eating or drinking enough and stress or sensory overload can heighten the gut’s sensitivity, making symptoms feel more intense.

It’s important to emphasise that this doesn’t mean IBS is “in your head.” IBS is a real, physiological condition. The gut and brain constantly influence each other and understanding this loop can help you interrupt patterns and behaviours that contribute to flare-ups.

Practical ways to manage both ADHD and IBS

Rather than a strict and rigid plan, try setting gentle and achievable routines that work with you and how ADHD presents for you.

  • Create a flexible structure and routine where you can check-in with your body to see if you need food or hydration.
  • Keep meals simple and adaptable, make snack plates, stock up on microwaveable grains and soups, buy yoghurts, wraps or any foods that you can easily prepare.
  • Incorporate mind–body tools, short breaks, movement, stretching or sensory-friendly snacks to support both digestion and nervous system regulation.
  • Prioritise hydration by aiming for 6-8 cups of fluid a day, keep water within reach, use reminders or try flavoured waters.

How dietitians can support neurodiverse clients

Working with a dietitian who understands neurodiversity can make a big difference. At Fresh Approach Nutrition, we tailor strategies to your individual ADHD traits and daily life. We can collaborate with your therapist or prescriber when needed, helping to reduce overwhelm and build confidence around food.

If you live with ADHD and IBS, you’re not imagining the connection. Our dietitians can help you find calm, clarity, and confidence in managing both. Book a free discovery call today, to learn about how we can support you.

References

  1. Lam L. What is the gut-brain connection activity? – Guts UK [Online]. Guts UK. 2024. Available from: https://gutscharity.org.uk/2024/07/what-is-the-gut-brain-connection-activity/
  2. Ng RWY, Chen Z, Yang L, Wong OWH, Leung ASY, Tsui KW, Kwok NMW, Tang LHY, Cheung PMH, Chan PKS, Ip M. Association between attention-deficit/hyperactivity disorders and intestinal disorders: A systematic review and Meta-analysis. Sci Rep. 2025 Jun 2;15(1):19278. doi: 10.1038/s41598-025-04303-x. PMID: 40456878; PMCID: PMC12130308.
  3. Dam SA, Mostert JC, Szopinska-Tokov JW, Bloemendaal M, Amato M, Arias-Vasquez A. The Role of the Gut-Brain Axis in Attention-Deficit/Hyperactivity Disorder. Gastroenterology Clinics of North America. 2019 Sep;48(3):407–31.

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