What are gastrointestinal symptoms? When people talk about gastrointestinal (GI) symptoms and autism they could be talking about a variety of different things including constipation, diarrhea, abdominal bloating/discomfort/irritability, gastroesophageal reflux/vomiting, or food selectivity/feeding issues.  Sometimes they may be referring to GI diseases like Crohn’s disease (an inflammatory bowel disease) or Celiac disease (an immune reaction […]