Any heightened immune response to an antigen; an allergy(noun)
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Use "hypersensitivity" in a sentence
"Type I, immediate anaphylactic hypersensitivity is characterised by the production of IgE antibodies against foreign proteins (Platts-Mills 2002)."
"Paranoid personality, characterized by hypersensitivity, rigidity, suspiciousness, feelings of envy and jealousy, excessive self-importance, and a tendency to blame others, has been proposed as the trait underlying paranoid states 439, 506."
"After Schlessinger aired a rant about race and what she called racial "hypersensitivity," which lasted nearly six minutes, and included eleven fully articulated, uncensored instances of the N-word, it wasn't the FCC that came down on her."