bad blood vs point of contention

bad blood

noun
  • Feelings of hostility or ill will. 

  • A particular disease; in some places, syphilis. 

  • A serious feud or long-standing grudge. 

point of contention

noun
  • A matter that forms the basis of a disagreement, struggle, etc. 

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