Grass pollen triggered anaphylaxis in an adolescent boy. 
Anaphylaxis is a rapid onset serious allergic reaction which may be fatal.  It is usually triggered by an agent such as a food, insect sting, or medication, through a mechanism involving immunoglobulin E (IgE) and the high-affinity IgE receptor on mast cells or basophils.  Anaphylaxis has been rarely described which results from pollen antigen exposure.  Here, we present unusual anaphylaxis, which results from inhaled pollen antigen in a 15-year-old boy.