title: Anxiety in historical perspective.
mesh_terms: D001007:Anxiety / Q000266:history; D001008:Anxiety Disorders / Q000266:history / Q000523:psychology; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D011582:Psychological Theory