Fragile X syndrome (a genetic disorder that causes intellectual disability)
Gastrointestinal symptoms (chronic constipation, abdominal pain, diarrhea, and fecal incontinence)
Immune disorders
Intellectual disability (IQ below 70 at age 6 or older)
Macrocephaly and microcephaly (a person’s head is a different size than average)
Obsessive-compulsive disorder (OCD)
Seizures and epilepsy
Sensory sensitivities
Sleep problems
Tourette syndrome (involuntary motor/verbal tics)
Tuberous sclerosis (abnormal growth in the brain and other organs)
Raising Children Network. (2016, June 23). Conditions that can occur with autism spectrum disorder. Retrieved from http://raisingchildren.net.au/articles/autism_spectrum_disorder_comorbidity.html