Prevalence estimates of homesickness vary widely depending on how homesickness is defined, the population under study, the circumstances of the separation, and the type of measurement. For example, prevalence of homesickness among adolescent boarding-school students is estimated to range from 16% to 91%.12 Because nearly all homesickness researchers have relied on retrospective self-reports, these wide-ranging prevalence estimates also reflect variation in people’s recollection of bouts of homesickness. In studies in which researchers measured homesickness at the time the individual was in the new environment, a prevalence of 83% to 95% has been reported.21,22 Prevalence rates measured while the subject was in the new environment were similar for children at summer camp5 and hospitalized children,11 with younger children being at greater risk. There seem to be no gender differences in the prevalence or intensity of homesickness,9,22 nor are there cultural differences in the way individuals and researchers define the term “homesickness.