stomachache vs tension

stomachache

noun
  • A pain in the abdomen, often caused by indigestion. (The pain is usually lower than the stomach and related to the intestines.) 

tension

noun
  • A feeling of nervousness, excitement, or fear that is created in a movie, book, etc.; suspense. 

  • The condition of being held in a state between two or more forces, which are acting in opposition to each other. 

  • State of an elastic object which is stretched in a way which increases its length. 

  • Force transmitted through a rope, string, cable, or similar object (used with prepositions on, in, or of, e.g., "The tension in the cable is 1000 N", to convey that the same magnitude of force applies to objects attached to both ends). 

  • Voltage. Usually only the terms low tension, high tension, and extra-high tension, and the abbreviations LT, HT, and EHT are used. They are not precisely defined; LT is normally a few volts, HT a few hundreds of volts, and EHT thousands of volts. 

  • Psychological state of being tense. 

verb
  • To place an object in tension, to pull or place strain on. 

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