Can you imagine merely breathing the wrong air and suffering an allergic reaction? This is the case for those who have severe allergies to wheat when they inhale wheat flour.
Wheat allergies can develop in childhood (after which the allergy is usually outgrown) or in adulthood. Allergic reactions to wheat include asthma, hives, atopic dermatitis, allergic rhinitis and anaphylactic shock.
People with wheat allergies have a difficult time avoiding it because it's so prevalent in Western diets. Besides being the major ingredient in breads, baked goods and cereals, wheat is also used as a thickening agent for sauces and soups.