Gastrointestinal symptoms include chronic constipation, abdominal pain, diarrhoea, reflux, vomiting, nausea, and bloating.  Research at ICAN has demonstrated that individuals with autism are at increased risk of experiencing gastrointestinal symptoms which greatly impact their quality of life.  Our research has demonstrated that gastrointestinal symptoms contribute to sleep problems, behavioural issues, and other comorbid conditions.