The cognitive, affective, and behavioral expression of self-stigma among people who use drugs in online substance use communities

This study investigates how self-stigma manifests in the naturalistic, longitudinal discourse of people who use drugs (PWUD) on Reddit. Moving beyond traditional cross-sectional surveys, the researchers developed a ten-indicator codebook covering cognitive (e.g., self-labeling, pessimism), affective (e.g., shame, despair), and behavioral (e.g., concealment, desire to quit) domains. By applying this codebook to 72,115 posts from 1,660 users using a validated large language model, the authors examined the prevalence, co-occurrence, and temporal sequencing of these stigma indicators over nearly two decades of online activity.

Self-stigma was identified in 5.3% of the analyzed posts, with 74% of the users exhibiting at least one indicator. The results reveal that self-stigma is highly integrated; behavioral indicators rarely appear in isolation and are strongly associated with core internalized indicators. Contrary to traditional progressive models of stigma—which often suggest that internal feelings precede behavioral consequences—this study found that behavioral indicators like the desire to quit often appear earlier in a user's posting trajectory than affective indicators like shame. Furthermore, while most indicators of self-stigma remain stable over time, the expression of pessimism and self-defeatism significantly increases, suggesting that the belief in one's inability to change may deepen with prolonged community engagement.

These findings challenge the assumption that self-stigma follows a linear, predictable stage-based progression. By identifying that behavioral markers often precede deep-seated affective distress, the study highlights a critical window for early digital intervention. The results suggest that online communities could serve as platforms for targeted support, particularly for users whose expressions of self-stigma begin to shift toward deepening pessimism. This research provides a scalable, mixed-methods framework that allows for the monitoring of stigma in naturalistic settings, offering a more nuanced understanding of how PWUD experience and articulate their struggles outside of formal clinical environments.