Symptoms of constipation in autistic adults: A systematic literature review on diagnostic methods and presence of actual symptoms.
Sudden sleep or behavior changes in autistic adults can signal constipation even when standard gut checks are negative.
01Research in Context
What this study did
DaWalt et al. (2025) searched every paper that tried to spot constipation in autistic adults.
They found no shared test or checklist. Teams use different rules, so one study may call the same person "fine" while another says "blocked."
What they found
The review shows that sleep loss, sudden irritability, or new self-harm can be the only signs of constipation in adults with autism.
Standard gut rules like the Rome criteria often miss these cases.
How this fits with other research
Peters et al. (2014) saw the same gut-behavior link in children. They found that severe constipation plus diarrhea predicted more rigid and compulsive rituals.
Prosperi et al. (2017) also reported that preschoolers with GI pain had worse sleep and self-injury, matching the adult pattern Wynn describes.
Stagnone et al. (2025) add a warning: adults with profound autism rarely show classic pain faces. Instead they shout, point, or hit, so teams must treat those shifts as possible medical distress.
Together the papers stretch one message across the lifespan: when an autistic person’s behavior or sleep suddenly worsens, think gut first.
Why it matters
You can add one quick question to your session: "Any change in sleep or challenging behavior this week?" If the answer is yes, request a medical review and mention constipation as a rule-out. No extra tools needed, just a new habit that may spare pain, meds, and restraint later.
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02At a glance
03Original abstract
Autism significantly impacts how individuals interact, communicate and perceive the world. Gastrointestinal disturbances, particularly constipation, are prevalent among autistic people, affecting their overall well-being. However, to the best of our knowledge, no specific guidelines are currently available regarding the diagnosis of constipation among this population. This systematic review investigates various diagnostic methods employed in studies addressing constipation among autistic adults. It aims to identify discrepancies between the symptoms reported based on diagnostic methods and the actual symptoms experienced by this population. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, nine studies conducted between 2012 and 2022 were included, revealing a predominance of non-prospective designs and an emphasis on children and adolescents. Diagnostic tools varied, including standardized criteria, questionnaires and observation. The prevalence of symptoms not outlined in the official criteria, such as sleep disorders and challenging behaviours, emerged as crucial aspects requiring comprehensive assessment in autistic people experiencing constipation. The study highlights the need for age-specific research in order to develop tailored assessment tools to improve diagnostic accuracy and enhance the overall management of constipation in autistic adults. Recognizing the diverse manifestations of constipation in this population is crucial for developing nuanced interventions and advancing healthcare strategies.Lay abstractAutistic people often experience gastrointestinal issues, with constipation being one of the most common concerns. However, there are currently no specific guidelines for diagnosing constipation in autistic adults. This makes it harder for healthcare providers to identify and treat the condition effectively. In this review, we analysed nine studies from 2012 to 2022 to understand the various methods used to diagnose constipation in autistic adults and their symptoms. We found that most studies used different approaches, such as questionnaires, standardized criteria, or observation. In addition, many studies focused on children and adolescents, leaving a gap in understanding symptoms in autistic adults. The studies highlighted symptoms that were not covered by official diagnostic criteria, such as sleep disturbances and challenging behaviours. This indicates a need for healthcare providers to consider a broader range of signs when diagnosing constipation in autistic people. Our review suggests that more research focusing on adults is needed to create tailored tools for diagnosing constipation in autistic adults. This will help improve accuracy and ensure better treatment outcomes. Understanding the unique ways constipation can present in autistic people is crucial for developing effective care strategies. For healthcare providers, this review emphasizes the importance of recognizing a wide range of symptoms when assessing constipation in autistic people. For policymakers, it highlights the need for age-specific guidelines to ensure that autistic adults receive the care and support they need. Further research will help refine these diagnostic tools and ultimately lead to better healthcare practices for autistic people.
Autism : the international journal of research and practice, 2025 · doi:10.1177/13623613241289114