The full answer
Yes, genetics play a major role — but they're not the whole story
Celiac disease has a strong genetic component. Almost everyone with celiac disease carries one of two gene variants, HLA-DQ2 or HLA-DQ8. But carrying one of these genes doesn’t mean someone will develop celiac disease — roughly 30–40% of the general population carries them, while only a small fraction ever develops the condition, so other factors (environmental triggers, timing of gluten introduction, and others not yet fully understood) are clearly also involved.
What this means for relatives
Because of this genetic link, celiac disease is significantly more common among first-degree relatives of someone already diagnosed, which is why testing close family members is often recommended even if they have no symptoms. Genetic testing itself can’t diagnose celiac disease, but it can rule it out — see how genetic testing is used in the diagnostic process.
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.