WordNet (r) 3.0 (2006):

hypersensitivity
    n 1: pathological sensitivity
    2: extreme sensitivity

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "hypersensitivity":
   allergy, anaphylaxis, considerateness, delicacy, empathy,
   exquisiteness, fineness, hairsplitting, hypercriticism,
   hyperesthesia, hyperpathia, hypersensitiveness, identification,
   irritability, morbid sensibility, nervousness,
   overconscientiousness, overcriticalness, overfastidiousness,
   overmeticulousness, overniceness, overnicety, overparticularity,
   overrefinement, overscrupulousness, oversensibility,
   oversensitiveness, oversensitivity, oversqueamishness,
   overtenderness, passibility, perceptiveness, perceptivity,
   photophobia, prickliness, responsiveness, sensitiveness,
   sensitivity, sensitization, soreness, supersensitivity, sympathy,
   tact, tactfulness, temperamentalness, tenderness, tetchiness,
   thin skin, ticklishness, touchiness