overreaction       
noun [ C or U ] uk/ˌəʊ.və.riˈæk.ʃən/ us/ˌoʊ.vɚ.riˈæk.ʃən/
 过度反应|过激反应
the action of reacting in an extreme, especially an angry or frightened, way
  She accused police of a massive overreaction. 她指控警察的过激反应。 
 The pollen causes an overreaction in the human immune system. 花粉引起了人体免疫系统的过度反应。 
 See: overreact
 - More examples
 - The newspaper accused everyone of hysterical overreaction.
 - This chronic disease is characterized by an overreaction of the immune system to protein substances.
 - The ban is an absurd overreaction to a problem that can be solved with simple measures.