Mental Health and Physical Activity Among Medical Students: A Cross-Sectional Study

Mental health issues and insufficient physical activity (PA) among students pose significant public health concerns. This study aimed to examine the prevalence of depression, anxiety, and stress symptoms, alongside PA levels, among Croatian medical students, with a focus on sex-specific differences and associations between these variables. A cross-sectional study was carried out during May and June 2025 among medical students at the University of Osijek, Croatia. Participants completed a self-reported questionnaire consisting of three sections: sociodemographic characteristics, the Depression, Anxiety, and Stress Scale-21 (DASS-21), and the International Physical Activity Questionnaire-Short Form (IPAQ-SF). The study included 244 students (70 males, 174 females) with a median age of 21 years (IQR: 20–23). Symptoms of depression, anxiety, and stress were reported by 33.1%, 48.4%, and 42.6% of participants, respectively. According to IPAQ-SF, 39.7% of students reported PA levels below current recommendations. Female students reported significantly higher depression (p = 0.009), anxiety (p < 0.001), and stress scores (p < 0.001), lower levels of moderate (p = 0.009) and vigorous PA (p < 0.001), and more time spent sitting (p = 0.006) compared to their male counterparts. Furthermore, significant positive correlations were identified between sitting time and depression (ρ = 0.17, p = 0.01), anxiety (ρ = 0.18, p = 0.006), and stress (ρ = 0.26, p < 0.001). Conversely, higher PA—particularly vigorous activity—was associated with lower levels of depression (ρ = −0.21, p = 0.001) and anxiety (ρ = −0.15, p = 0.018). Croatian medical students demonstrated a substantial prevalence of depression, anxiety, and stress symptoms, combined with inadequate levels of PA. These findings highlight the importance of implementing strategies aimed at supporting mental health and fostering regular PA among future healthcare professionals.