Effectiveness of the Group Unified Protocol for Emotional Disorders in Adults in a Public Mental Health Setting

This study has three primary objectives: 1. To adapt the Spanish version of the Unified Protocol for Transdiagnostic Treatment of Emotional Disorders (UP; Barlow et al., 2011, 2019a, 2019b) for delivery in a group format within the Spanish Public Mental Health System for adults diagnosed with emotional disorders. 2. To evaluate the effectiveness of the intervention. 3. To assess its clinical feasibility and acceptability in routine clinical practice. Outcomes will include anxiety, depression, somatic symptoms, transdiagnostic variables, functional impairment, quality of life, and participant satisfaction. These outcomes will be assessed at baseline, post-treatment, and 3-month follow-up. The intervention is expected to improve emotional symptoms, functional impairment, and quality of life. In addition, the study will explore whether this group-based transdiagnostic approach may help lower demand on public mental health services.

Inclusion Criteria: * Aged 18 to 65 years. * Ability and willingness to provide written informed consent. * Sufficient proficiency in Spanish to participate in the intervention and complete study assessments. * Sufficient cognitive capacity to understand the intervention content. * A primary diagnosis of an emotional disorder with mild, moderate, or severe symptom severity, including Depressive Disorders, Anxiety Disorders, Obsessive-Compulsive and Related Disorders, Trauma and Stressor-Related Disorders, Dissociative Disorders and Somatic Symptom and Related Disorders. * Presence of emotional symptoms (e.g., anxiety, depressive, or phobic symptoms), somatic symptoms, obsessive symptoms, and/or avoidance behaviors associated with clinically significant impairment, as indicated by moderate or higher scores on the GAD-7, PHQ-9, and/or PHQ-15. Exclusion Criteria: * Refusal to provide informed consent or withdrawal of consent during the study. * Current severe substance use disorder or behavioral addiction. * Current high suicide risk. * Current psychotic symptoms or psychotic disorder. * Neurological disorders or severe medical conditions that could interfere with participation in or adherence to the intervention. * Intellectual disability, significant language difficulties, or any other condition that may impair the participant's ability to understand the intervention content.