aggravation vs trigger point

aggravation

noun
  • The act of aggravating, or making worse; used of evils, natural or moral; the act of increasing in severity or heinousness; something additional to a crime or wrong and enhancing its guilt or injurious consequences. 

  • An extrinsic circumstance or accident which increases the guilt of a crime or the misery of a calamity. 

  • Provocation, irritation, annoyance. 

  • Exaggerated representation. 

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 aggravation and trigger point occurred in a corpus of books? (source: Google Ngram Viewer )