Objective: To explore the relationships between self-concealment, social anxiety, loneliness, and Internet addiction. Methods: 312 college students were surveyed with self-concealment scale, Social Anxiety Subscale of the Self- Consciousness Scale, UCLA Loneliness Scale, and Young’s Internet Addiction Test. Results: ① Correlation analysis showed that self-concealment, social anxiety, loneliness and Internet addiction were significantly and positively correlated with each other. ②Multiple mediation modeling indicated there were three paths th...