hyperreactive       
adjective  medical specialized (also hyper-reactive) uk/ˌhaɪ.pə.riˈæk.tɪv/ us/ˌhaɪ.pɚ.riˈæk.tɪv/
 反应过度的
reacting very strongly to physical stimuli (= things that cause a reaction)
  Asthma attacks are caused by hyperreactive airways. 哮喘发作是因气道过度反应引起的。 
 The patient is hyper-reactive to unexpected or loud stimuli.
  - More examples
 - Baby animals that are separated from caregivers may become hyperreactive to stress later.
 - He may possibly have suffered from hyperreactive airway (HRA) disease in the past.
 - The unexpected finding was explained by researchers as a hyper-reactive response to a positive situation.