Not clear: I presume however that what you meant was can something else mimic an allergic reaction when it is not. The answer then is yes. Symptoms from an allergic reaction is from the chemical mediators (of which histamine and leukotrienes are more prominent) However there are others which can cause release of similar chemical mediators thus similar symptoms. Reaction to x-ray dye is just one example.
Answered 7/4/2014
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