Diagnosis

Before a diagnosis of allergic disease can be confirmed, the other possible causes of the presenting symptoms should be carefully considered.[56] Vasomotor rhinitis, for example, is one of many maladies that shares symptoms with allergic rhinitis, underscoring the need for professional differential diagnosis.[57] Once a diagnosis of asthma, rhinitis, anaphylaxis, or other allergic disease has been made, there are several methods for discovering the causative agent of that allergy.