What Are Some Symptoms of Wheat Allergy?

Symptoms of an allergic reaction to wheat include swelling, itching or irritation of the mouth, skin rashes, nasal congestion, headaches, vomiting, intestinal cramping, diarrhea and, in severe cases, anaphylaxis, according to the Mayo Clinic. These symptoms can occur minutes to hours after eating foods containing wheat. In people with a wheat allergy, any exposure to wheat or its proteins creates an immune system reaction ranging from mild to severe.