Harvard Health Tips
In people with celiac disease, a protein in wheat, barley, and rye called gluten triggers the immune system to attack the villi. These are finger-like projections that carpet the inside of the small intestine. The classic symptoms of celiac disease include abdominal pain, bloating, and diarrhea. Sensitivity to gluten is a lifelong problem, so anyone with celiac disease, regardless of symptoms, should keep to a strict gluten-free diet.