The full answer
Yes — it's one of the classic symptoms
Diarrhea is one of the most recognized symptoms of celiac disease. It happens because gluten-triggered damage to the small intestine’s villi reduces the surface area available to absorb water and nutrients, so more fluid and undigested food move through the digestive tract than normal.
It doesn't affect everyone the same way
Not everyone with celiac disease has diarrhea — some people instead experience constipation, or alternate between the two, which is part of why celiac disease is so often mistaken for IBS. Persistent digestive changes without a clear cause are worth raising with a doctor and asking about celiac blood testing.
Important context
Individual symptoms, reactions, medical histories, food products, and local labeling rules can vary. Community experiences are not medical evidence.
For personal medical decisions, diagnosis, testing, or treatment, consult a qualified healthcare professional.