Celiac disease is an autoimmune disorder triggered by eating gluten, a protein found in wheat, rye, and barley. When people with celiac disease consume gluten, their immune system attacks the small intestine, leading to damage and nutrient absorption issues. Common symptoms in adults include stomach problems like gas, diarrhea, bloating, and abdominal pain. Other symptoms can be weight loss, constipation, nausea, and vomiting. Over time, celiac disease can cause osteoporosis and osteomalacia due to poor nutrient absorption. These conditions make bones weak and more prone to fractures. Celiac disease can also cause fatigue, headaches, itchy skin, and mouth ulcers. In children, symptoms often include digestive issues like gas, diarrhea, and abdominal bloating, as well as growth problems and weight loss. A gluten-free diet is essential for managing celiac disease and preventing complications like bone health issues.