Abstract
This research investigates how loneliness influences alexithymia among Chinese adolescents, drawing on Internet Compensation Theory and the Social Compensation Hypothesis. The study highlights the mediating role of problematic smartphone use (PSU) and the moderating effect of fear of negative evaluation (FNE). Using a cross-sectional design, data were collected from 688 secondary school students via the online Questionnaire Star platform. The results indicate that loneliness is positively associated with both PSU and alexithymia. PSU partially mediates the relationship between loneliness and alexithymia (based on statistical models). Additionally, FNE plays a moderating role in the relationship between loneliness and PSU or alexithymia. Subgroup analysis revealed that male students reported significantly higher levels of alexithymia than females. Among individuals with higher levels of FNE, the positive correlation between loneliness and alexithymia was significantly stronger. This study proposes a mechanism involving internal emotion (loneliness), external behavior (PSU), and cognitive evaluation (FNE), offering a systematic theoretical basis for adolescent mental health interventions.