Common symptoms of wheat allergy include:

• Hives or skin rash;
• Swelling, itching or irritation of the mouth or throat;
• Nausea;
• Stomach cramps;
• Indigestion;
• Vomiting;
• Diarrhea;
• Sneezing;
• Headaches;
• Difficulty breathing.

Someone who is allergic to wheat is likely to develop symptoms within minutes to hours after eating wheat.