supersensitivity
/ˌsuːpəˌsɛnsɪˈtɪvɪti/ /ˌsjuːpəˌsɛnsɪˈtɪvɪti/noun
1Extreme or excessive sensitivity.
2 Physiology and Medicine. Increased responsiveness or reactivity to a neurotransmitter or drug, especially in a structure deprived of its normal nerve supply.
Origin
Mid 19th century; earliest use found in Temperance Spectator. From super- + sensitivity.