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- Immunology: Presence of an autoimmune disorder in early childhood may increase the risk of development ASD in later life, as well as strongly correlated with the severity of communication challenges
- Asthma: 1.6 times more likely
- Frequent and/or severe headaches: 1.8 times more likely
- Chronic sleep problems: Over 50% of individuals with ASD have one or more sleep issues
- Chronic gastrointestinal disorders: 8 times more likely, including chronic constipation or diarrhea. Additionally, individuals with ASD have higher food selectivity
- Epilepsy: Approximately one-third of people with ASD have a seizure disorder.
- Incontinence: Children with ASD may have nocturnal enuresis and daytime urinary incontinence more frequently than their peers.