Worry and rumination are generally considered a specific cognitive vulnerability factor that seems to be involved in the etiology and maintenance of depressive and anxiety problems. The existing study aimed to investigate the relation among worry, rumination, depressive and anxiety problems among secondary schools' adolescents, hence, a descriptive cross sectional study design was used. Demographic Characteristics sheet of adolescents, The Penn State Worry Questionnaire for Children, Ruminative Response Scale and Beck Depression Inventory& Beck Anxiety Inventory and were used as a self- administered questionnaires to collect data from 480 secondary schools' student. Study results revealed that there were significant positive correlation between worry, rumination, depressive and anxiety problems .Conclusion: worry and rumination contribute to adolescents' depressive and anxiety problems. Consequently it is recommended to conduct school and community-based mental health promotion and prevention programmes directed toward adolescents, their families, educational staff and others who have direct contact with adolescents. And consider worry and rumination clinically can be effective in treatment of depression and anxiety.