<unk>  affects up to 12% of people at some point in their life. There may be a large amount of underreporting of<unk> s as many people do not seek treatment, with some surveys conducted in the US finding that 70% of the population reports having one or more unreasonable fears.<unk> s have a lifetime prevalence rate of 7.4% and a one-year prevalence of 5.5% according to data collected from 22 different countries. The usual age of onset is childhood to adolescence. During childhood and adolescence, the incidence of new<unk> s is much higher in females than males. The peak incidence for<unk> s amongst females occurs during reproduction and childrearing, possibly reflecting an evolutionary advantage. There is an additional peak in incidence, reaching nearly 1% per year, during old age in both men and women, possibly reflective of newly occurring physical conditions or adverse life events. The development of phobias varies with subtypes, with animal and blood injection phobias typically beginning in childhood (ages 5–12), whereas development of situational<unk> s (i.e., fear of flying) usually occurs in late adolescence and early adulthood. In the USA, the lifetime prevalence rate is 12.5% and a one-year prevalence rate of 9.1%. An estimated 12.5% of U.S. adults experience<unk>  at some time in their lives and the prevalence is approximately double in females compared to males. An estimated 19.3% of adolescents experience<unk> , but the difference between males and females is not as pronounced.
Specific phobia
Blood phobia
Driving phobia
Separation anxiety disorder
Generalized anxiety disorder
Social anxiety disorder
Agoraphobia
Body dysmorphic disorder