Acute physical, sensory and emotional response to stimulation overload in the surrounding world. A child's or adults's senses may be superacute, for instance, in the case of hearing, listening to a stereo or TV is only possible when the volume is turned very low, otherwise it is painful. Noisy shopping malls exhaust hypersensitive children and adults. Cf. The Highly Sensitive Person by Elaine Aron.
overreaction to an allergen, leading to pathological changes in tissues; also called allergy
Excessive or abnormal reactivity to a stimulus.
abnormal sensitivity; an exaggerated immune response to an antigen, drug, etc.