Study aim: The Effectiveness of Mindfulness Training Based on Stress (MBSR) Reduction on Reducing Arousal Levels, Anxiety Sensitivity, and Anger Suppression in Students with Symptoms of Social Anxiety Disorder Design: A controlled clinical trial with parallel groups, without blinding, randomized, on 40 patients. The rand function of Excel software will be used for randomization. Settings and conduct: The statistical population of this study includes all female and male students at various academic levels of Islamic Azad University, Ahvaz Branch, in the 2025–2026 academic year who exhibit symptoms of social anxiety disorder (i.e., score below the cutoff on the SIAS scale). In the sample selection stage, convenience sampling will be used. After selecting a sample of 40 participants, and based on the study’s inclusion and exclusion criteria, the participants will be randomly assigned to two groups: the “Mindfulness-Based Stress Reduction” group (intervention group) and the “waiting list” group (control group). Participants/Inclusion and exclusion criteria: Inclusion criteria: Being a student in one of the academic programs of the university under study. Having symptoms of social anxiety disorder based on a clinical interview or a high score on the relevant standard questionnaire. Exclusion criteria: Not willing to participate in the research, participating simultaneously in similar psychological or pharmacological courses. Intervention groups: Intervention group: All individuals who will receive the mindfulness-based stress reduction training intervention. Control group: All individuals who will not receive any intervention. Main outcome variables: Arousal, Anxiety Sensitivity, Anger, Social Anxiety