<p>The rapid expansion of digital media and communication technologies has profoundly influenced individuals’ daily lives and their psychological well-being. This study examined the relationships between cyberchondria, social media addiction, and anxiety symptoms, with a particular focus on the mediating role of social media addiction. A total of 846 young adults aged 18–30 years participated in this cross-sectional study (69.4% female; mean age = 21.25 years). Data were collected using validated measures of social media addiction, cyberchondria, and anxiety symptoms. Group comparisons and mediation analyses were conducted using SPSS (version 25). The results revealed significant demographic differences, with women reporting higher levels of social media addiction, cyberchondria, and anxiety symptoms than men. Social media addiction was more pronounced among participants aged 18–20 years, whereas cyberchondria tended to increase with age. Participants with lower income levels and chronic illnesses reported higher social media addiction and anxiety symptoms. Extended social media use and frequent online health information seeking were associated with elevated levels of all the study variables. Mediation analysis indicated that social media addiction partially mediated the relationship between cyberchondria and anxiety symptoms, accounting for 30.9% of the total effects. Overall, the findings suggest that cyberchondria, social media addiction, and anxiety symptoms are interrelated and associated with emotional dysregulation. This study contributes to a nuanced understanding of the psychological consequences of digital media use and highlights the importance of multidimensional mental health strategies in the digital era.</p>