Short answers, pulled from the story.
David Barlow defines anxiety as a future-oriented mood state where one feels unprepared for upcoming negative events. This emotion differs from fear because it focuses on anticipated threats rather than present dangers.
Edvard Munch painted The Scream in 1893 to capture a complex human experience showing anxiety as an unpleasant state of inner turmoil and dread over anticipated events. That artwork illustrates how this feeling acts as an overreaction to situations that only seem menacing to the observer.
Specific phobias affect nearly 12% of people while social anxiety disorder affects 10%. These conditions occur about twice as often in women than they do in men generally and begin before the age of 25 for most individuals.
A receptor gene called NTRK2 was linked to anxiety in large genome-wide investigations alongside findings related to TMEM132D, COMT, and MAO-A. Genetic differences account for about 43% of variance in panic disorder and 28% in generalized anxiety disorder according to estimates ranging from 25 to 40% depending on type and age-group under study.
The World Health Organization classified these distinctions in their eleventh revision of the International Classification of Diseases published in 2023. This document formalizes the separation between normal anxiety and anxiety disorders involving feelings experienced excessively or persistently for approximately six months.