anxiety vs trouble

anxiety

noun
  • An uneasy or distressing desire (for something). 

  • An unpleasant state of mental uneasiness, nervousness, apprehension and obsession or concern about some uncertain event. 

  • A state of restlessness and agitation, often accompanied by a distressing sense of oppression or tightness in the stomach. 

trouble

noun
  • A distressing or dangerous situation. 

  • A difficulty, problem, condition, or action contributing to such a situation. 

  • A fault or interruption in a stratum. 

  • A malfunction. 

  • A violent occurrence or event. 

  • Efforts taken or expended, typically beyond the normal required. 

  • Liability to punishment; conflict with authority. 

  • Wife. Clipping of trouble and strife. 

verb
  • In weaker sense: to bother or inconvenience. 

  • To mentally distress; to cause (someone) to be anxious or perplexed. 

  • To worry; to be anxious. 

  • To take pains to do something. 

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