Mental health challenges remain a significant issue in both developing and developed countries, requiring global attention and intervention. In the modern era, psychological distress caused by various life stressors and negative experiences often triggers brooding, a maladaptive form of rumination characterized by compulsive focus on the causes or consequences of distressing events. This study aimed to examine the effect of expressive writing on the level of brooding in late adolescents. The research employed a quasi-experimental design with a one-group pretest-posttest approach, involving ten late adolescents in Banda Aceh selected through purposive sampling. The instrument used was the Ruminative Response Scale (RRS). The results showed a significant decrease in brooding levels after the expressive writing intervention (z = -2.810, p = 0.005). These findings showed that expressive writing is an effective, simple, and practical psychological intervention for reducing brooding in late adolescents. Practically, the results of this study can serve as a reference for psychologists and counselors to integrate expressive writing as one of the intervention strategies to enhance adolescent mental well-being.
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