section_path: Diagnosis/Differential diagnosis
section_name: Differential diagnosis
paragraph_text: Differential diagnosis
  
  Before a diagnosis of allergic disease can be confirmed, other plausible causes of the presenting symptoms must be considered. Vasomotor rhinitis, for example, is one of many illnesses that share symptoms with allergic rhinitis, underscoring the need for professional differential diagnosis. 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.