diarrhea vs the shits

diarrhea

noun
  • A gastrointestinal disorder characterized by frequent and very soft or watery bowel movements. 

  • The watery or very soft excrement that comes from such bowel movements. 

the shits

noun
  • Diarrhoea. 

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