The metaverse, a digital space combining physical and virtual realities, is being explored for mental health applications. This review discusses early studies using metaverse technologies in psychiatric care, highlighting their potential to treat mental disorders through immersive, socially interactive environments. The metaverse offers unique opportunities for creating shared, controlled virtual scenarios that can enhance social interactions and therapeutic outcomes. Recent studies show that metaverse-based interventions, such as avatar-based sexual therapy for female orgasm disorders and social skills training for autism spectrum disorders, have shown promising results. These interventions leverage the metaverse's ability to simulate real-world interactions, providing a safe and customizable environment for therapy. The metaverse also offers the potential to improve mental health through brain-to-brain synchrony, where neural activity aligns during social interactions. This aligns with theories of predictive coding, which suggest that the brain constantly generates and updates models of the environment. The metaverse can be used to create immersive experiences that help recalibrate these models, potentially improving mental health outcomes. Additionally, the metaverse's integration of technologies like virtual reality, augmented reality, and blockchain enables personalized and interactive therapeutic environments. However, the metaverse presents challenges, including issues of identity, social isolation, and data privacy. While the metaverse shows promise in mental health treatment, further research is needed to fully understand its potential and address these challenges. The integration of AI and other technologies will be crucial in developing effective and safe metaverse-based mental health interventions. Overall, the metaverse offers a new frontier in mental health care, with the potential to revolutionize treatment approaches through immersive, socially interactive, and personalized experiences.The metaverse, a digital space combining physical and virtual realities, is being explored for mental health applications. This review discusses early studies using metaverse technologies in psychiatric care, highlighting their potential to treat mental disorders through immersive, socially interactive environments. The metaverse offers unique opportunities for creating shared, controlled virtual scenarios that can enhance social interactions and therapeutic outcomes. Recent studies show that metaverse-based interventions, such as avatar-based sexual therapy for female orgasm disorders and social skills training for autism spectrum disorders, have shown promising results. These interventions leverage the metaverse's ability to simulate real-world interactions, providing a safe and customizable environment for therapy. The metaverse also offers the potential to improve mental health through brain-to-brain synchrony, where neural activity aligns during social interactions. This aligns with theories of predictive coding, which suggest that the brain constantly generates and updates models of the environment. The metaverse can be used to create immersive experiences that help recalibrate these models, potentially improving mental health outcomes. Additionally, the metaverse's integration of technologies like virtual reality, augmented reality, and blockchain enables personalized and interactive therapeutic environments. However, the metaverse presents challenges, including issues of identity, social isolation, and data privacy. While the metaverse shows promise in mental health treatment, further research is needed to fully understand its potential and address these challenges. The integration of AI and other technologies will be crucial in developing effective and safe metaverse-based mental health interventions. Overall, the metaverse offers a new frontier in mental health care, with the potential to revolutionize treatment approaches through immersive, socially interactive, and personalized experiences.