dyscrasia vs illness

dyscrasia

noun
  • Any bodily disorder, especially regarding the blood. 

  • Imbalance of the four bodily humors (blood, black and yellow bile, phlegm) that was thought to cause disease. 

illness

noun
  • An instance of a disease or poor health. 

  • A state of bad health or disease. 

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