<unk>  may be classified into 2 subtypes/groups: Immunologic-IgE mediated and Immunologic-non-IgE mediated. 
The diagnostic criteria must have one of the three of the following: 
1. Acute onset of disruption of the skin or mucosal tissue with either reduced blood pressure or decreased perfusion and/or respiratory compromise.
2. Exposure to a likely allergen followed with two of the following: involvement of mucosal tissue, respiratory compromise, gastrointestinal disturbances, or reduced blood pressure
3. Reduced blood pressure after exposure to a known allergen
Anaphylaxis classification
Allergy classification
Drug allergy classification
Conjunctivitis classification
Stevens-Johnson syndrome classification
Syncope classification
Vertigo classification
Diphtheria classification