Even today, the doctors are confused around the mystery that revolves around the celiac disease. What is a celiac disease? It is an immune reaction to your gluten that makes your small intestine swelled up. It takes almost 6 to 10 years before it gets properly diagnosed. The person with this condition can have problems in digestion while eating food that has gluten, like, wheat, barley, and rye. Celiac disease also causes itchy skin, headaches, joint pain, and heartburn. It is better to see a doctor if the symptoms don’t show any change.