anaphylactic shock
From Longman Dictionary of Contemporary Englishanaphylactic shockan‧a‧phy‧lac‧tic shock /ˌænəfəlæktɪk ˈʃɒk $ -ˈʃɑːk/ noun [uncountable] medical a very sudden serious physical reaction that is caused by an allergy to something such as nuts, eggs, or the sting of some insects. The reaction causes shock, breathing difficulties, and sometimes death.Examples from the Corpusanaphylactic shock• Whether it was anaphylactic shock from a unique allergy or asphyxiation from catching the peanuts in the throat, this is unknown.