bellyache vs enteritis

bellyache

noun
  • Any pain in the belly, stomach, or abdomen. 

verb
  • To unnecessarily complain or whine, often about simple matters. 

enteritis

noun
  • Inflammation of the intestines, generally the small intestine, that may lead to diarrhea. 

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