intervention vs trigger point

intervention

noun
  • The action of intervening; interfering in some course of events. 

  • An orchestrated attempt to convince somebody with an addiction or other psychological problem to seek professional help and/or change their behavior. 

  • An action taken or procedure performed; an operation. 

  • A legal motion through which a person or entity who has not been named as a party to a case seeks to have the court order that they be made a party. 

trigger point

noun
  • An event, arrangement, provocation, etc. that leads a certain, generally violent or angered, action to be taken. 

  • A hyperirritable spot in the skeletal muscle; a point in tender muscle that tends to elicit pain upon pressure or touch. ᵂᵖ 

How often have the words intervention and trigger point occurred in a corpus of books? (source: Google Ngram Viewer )