[영문]Early adolescents in the United States are increasingly exposed to a culture of worrisome messages. A degree of adolescent worry is normal, but the likelihood of a young person being anxious or depressed increases with the perceived number of worries. This study examined the effect of age, gender, and worry behavior on frequency of 8 adolescent worries. Data were obtained from 1004 9- to 13-year-old students visiting 10 health education centers in 7 states. Students responded via individual, electronic keypads. Multivariate logistic regression revealed that boys worry more about the future, whereas girls worry more about being liked or being overweight. The oldest adolescents worry most about their appearance, being overweight, their friends, and problems at home. Adolescents who prefer talking to parents when worried are less likely to worry about being liked, while those who keep worries to themselves have more worries about grades. Those who turn to parents for information are less likely to worry about being liked, failure, their future, and their friends than those who turn to other sources (teachers, Internet, and friends). Recommendations are given to assist health educators and other school staff to recognize frequent worriers and plan school-based approaches to address their needs.