Common symptoms of a gluten intolerance include diarrhea, cramping, bloating, gas, constipation, and anemia. Celiac disease, which is due to gluten intolerance and is an autoimmune disease, has many of the same symptoms. Another symptom of celiac disease is a unique rash called dermatitis herpetiformis. The intensely itchy rash may show up on your elbows, knees, and buttocks. If you have these symptoms, talk to your doctor.