 Certain allergy tests may not be suitable to detect all wheat allergies, resulting in cryptic allergies.Because many of the symptoms associated with wheat allergies, such as sacroiliitis, eczema and asthma, may be related or unrelated to a wheat allergy, medical deduction can be an effective way of determining the cause.If symptoms are alleviated by immunosuppressant drugs, such as Prednisone, an allergy-related cause is likely.