Summary: A long-term UC Davis MIND Institute study tracking 475 children found that children with autism are significantly more likely than their typically developing peers to experience persistent gastrointestinal (GI) problems. These symptoms often occur together, remain through early and middle childhood, and are closely linked to sleep difficulties, communication challenges, behavior differences, and sensory processing issues.
The study highlights the importance of assessing and treating GI symptoms as part of comprehensive autism care. Addressing even unexplained digestive issues can improve daily comfort and may support better developmental and behavioral outcomes.
Key Facts:
- Higher prevalence: Children with autism reported more frequent GI symptoms at every age measured.
- Persistent and multiple symptoms: GI issues were more likely to be chronic and to occur in combination.
- Broad impact: GI symptoms were associated with sleep problems, anxiety, communication difficulties, sensory sensitivities, and repetitive behaviors.
- Clinical implication: Proactive screening and treatment of GI problems can be an important part of improving quality of life for autistic children.
Source: UC Davis MIND Institute
Study overview:
Researchers followed 475 children aged 2 to 12 years—322 diagnosed with autism spectrum disorder (ASD) and 153 with typical development—using detailed physician-led parent interviews at multiple time points. The longitudinal design allowed the research team to measure both how often GI symptoms occurred and how long they persisted across early and middle childhood.
Physicians evaluated nine common GI symptoms—such as constipation, diarrhea, abdominal pain, and bloating—and classified symptoms through clinical consensus. Compared with the typically developing group, autistic children had more symptoms at each assessment, were more likely to experience several symptoms at once, and showed greater symptom persistence over time. Many of these problems lacked an identifiable medical cause, underscoring the need for attentive clinical follow-up.
Connections with behavior, sleep and sensory processing
The study found clear associations between the number and persistence of GI symptoms and additional areas of difficulty. Children with more frequent GI issues were also more likely to exhibit:
- sleep disturbances
- internalizing symptoms such as anxiety
- increased irritability
- communication challenges
- sensory sensitivities
- restricted and repetitive behaviors
“These findings remind us that the brain and body are deeply connected,” said Christine Wu Nordahl, the study’s senior author. When a child experiences stomach pain or ongoing digestive problems, the effects can extend beyond digestion and influence sleep, mood, and daily interactions.
Lead author Bibiana Restrepo, a developmental pediatrician, emphasized that many parents report digestive concerns but often lack a clear medical explanation. “Our results show these symptoms are common, often persistent, and can affect many aspects of a child’s life. Identifying and treating GI problems may improve both comfort and developmental progress,” she said.
Clinical recommendations and implications for families
This study is one of the largest and most rigorous longitudinal analyses of GI symptoms in autistic children from early to middle childhood. The authors stress that many GI problems are treatable even when a specific medical diagnosis is not found. Routine screening for GI symptoms by pediatricians, gastroenterologists, and autism specialists can lead to earlier intervention and better management.
Greater collaboration between clinicians, educators, and families can ensure that GI health becomes a standard part of comprehensive autism care. Addressing digestive symptoms may reduce discomfort that interferes with sleep, learning, communication, and behavior, helping children to engage more fully in daily life and therapies.
Funding: Supported by the National Institute of Mental Health and the UC Davis MIND Institute, with additional support from the MIND Institute Intellectual and Developmental Disabilities Research Center.
About this autism research news
Author: Nadine Yehya
Source: UC Davis MIND Institute
Contact: Nadine Yehya – UC Davis
Image: Image credit to Neuroscience News
Original Research: “A longitudinal evaluation of gastrointestinal symptoms in children with autism spectrum disorder” by Bibiana Restrepo et al., published in Autism. Open access study.
Abstract
A longitudinal evaluation of gastrointestinal symptoms in children with autism spectrum disorder
Gastrointestinal symptoms are frequently reported in children diagnosed with autism spectrum disorder. This longitudinal study compared GI symptom trajectories in children with ASD to same-aged children with typical development. A total of 475 children (322 ASD, 153 typical development) were evaluated at up to three time points between ages 2 and 12. Nine common GI symptoms and formal GI diagnoses were assessed through physician-administered parent interviews and clinical consensus classification. The study compared the frequency and persistence of symptoms across groups and evaluated associations with internalizing and externalizing behaviors, sleep problems, sensory issues, repetitive behaviors, and social communication. Children with autism showed more GI symptoms at each time point and were more likely to have multiple and persistent symptoms. The presence and number of GI symptoms were linked to greater challenges in internalizing behaviors, sleep, communication, sensory processing, and repetitive behaviors. Overall, the ASD group reported more gastrointestinal symptoms without known etiology throughout childhood in this well-characterized longitudinal sample.