hyperreactivity       
noun [ U ]  medical specialized (also hyper-reactivity) uk/ˌhaɪ.pə.ri.ækˈtɪv.ə.ti/ us/ˌhaɪ.pɚ.ri.ækˈtɪv.ə.t̬i/
 反应过度
a condition in which someone reacts very strongly to stimuli (= things that cause reaction)
  Evidence of bronchial hyper-reactivity was obtained in 113 patients. 从113名患者身上取得了支气管过度反应的证据。 
 The condition is associated with hyperreactivity to emotional stimuli.
 - More examples
 - Vitamin C may have a protective effect on airway hyperreactivity in some patients.
 - Allergens or other triggers set off a cascade of events in the immune system leading to inflammation and hyperreactivity in the airways.
 - 25% of sick firefighters were found to have airway hyperreactivity.