Association of Autism Spectrum Disorders and Inflammatory Bowel Disease.

Lee et al. (2018) looked at medical records of kids with autism and matched peers. They checked how many in each group had Crohn’s disease or ulcerative colitis. The design was a simple case-control review pulled from large health databases.

Kids with autism were more likely to meet full criteria for both Crohn’s and colitis. The link stayed strong after basic matching for age and sex. In plain words, IBD is not rare in autism; it shows up more than clinicians expect.

Kaiser et al. (2022) pooled over 11 million kids and found the same bump in IBD, so the 2018 signal holds at scale. Cook (2009) once said only mild GI issues like constipation rise in autism; Maunoo’s 2018 data move the needle to full-blown IBD, updating the story. Bottema-Beutel et al. (2023) add a twist: gut pain and internalizing symptoms fuel each other. So the bowel disease flagged in 2018 can loop back and worsen anxiety or self-injury you see in session.

If a learner suddenly hits more SIB, loses sleep, or avoids food, think below the belt. Ask parents about bloody stool, weight loss, or long bathroom trips. A quick GI referral can cut pain and may even drop problem behavior without extra ABA hours.