Wheat allergy is a food allergy that involves IgE and mast cell response but can also be a contact allergy. The symptoms of wheat allergy (ingested) are sudden and include such symptoms as hives, asthma, abdominal cramps, nausea, vomiting and in rare cases anaphylaxis. Contact symptoms include eczema, hives, asthma, rhinitis and Angioedema.
Wheat allergy is quite rare.
Wheat intolerance is a slower onset of symptoms due to the fact that the body is having difficulty digesting the wheat. The symptoms of wheat intolerance include aching joints, gastro-intestinal issues, depression, eczema, and low iron levels.
Celiac disease is a genetic auto-immune disorder of the small intestine caused by a reaction to gliadin, a gluten protein found in wheat, rye, and barley.
Exposure to gluten causes an inflammatory reaction that leads to villous atrophy. This interferes with the absorption of nutrients.