Some individuals with celiac disease continue to experience recurring symptoms. According to the website for the Celiac Disease Foundation (CDF), the most common reason is continued gluten ingestion.
Did you discover you were still unknowingly ingesting gluten after you started the gluten-free diet? What was the "offending" product?
The most common reason for persistent symptoms is continuing to ingest gluten, either knowingly or unknowingly. Patients are encouraged to meet with a dietitian knowledgeable about celiac disease and the gluten-free diet to learn about the “hidden” source of gluten.