Research from Warwick suggests that individuals with ADHD are significantly more likely to experience digestive problems, highlighting a potentially overlooked aspect of managing the condition.
Researchers at the University of Warwick have found a strong link between attention deficit hyperactivity disorder and digestive health problems after pooling evidence from more than 1.9 million people across 23 studies. The analysis, published in the Journal of Attention Disorders, suggests that people with ADHD were nearly 50% more likely to report gastrointestinal symptoms than those without the condition.
Some individual problems showed even sharper differences. According to the study, people with ADHD had almost twice the odds of constipation, a 58% higher likelihood of irritable bowel syndrome and more than four times the odds of encopresis, a condition that involves loss of bowel control. The findings do not show that ADHD causes digestive illness, but they do point to a pattern that clinicians may be overlooking.
The review drew on studies from countries including the United States, Sweden, Germany and South Korea, with participants aged between 2 and 65. The researchers said the work is the first systematic review focused specifically on gastrointestinal symptoms in ADHD. They also placed the findings in the wider context of growing research on the gut-brain axis, the two-way communication system linking the digestive tract and the brain.
Possible explanations include ADHD-related impulsivity and irregular eating habits, which may affect digestion, as well as side effects from ADHD medicines, including constipation. Previous research has also pointed to differences in gut bacteria in people with ADHD, raising the possibility that the microbiome may play a role. Sarah Blake, a medical student at Warwick Medical School and co-lead author, said: “Almost every gut symptom we looked at: constipation, IBS, even indigestion, appeared to be associated with ADHD. These symptoms can have a real impact on daily life, but they could easily be overlooked if the focus is on ADHD itself.” Saran Shantikumar, associate clinical professor at Warwick Medical School, said: “We can’t yet say ADHD causes these gut problems, or exactly what is driving the link, but the pattern is striking enough to warrant attention. Clinicians caring for people with ADHD may want to consider asking about gastrointestinal symptoms, particularly if they may be affecting quality of life.”
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
