Alopecia Areata Does Not Increase the Risk of Venous Thromboembolism: An All of Us Case-Control Study

This study investigated the potential association between alopecia areata (AA) and venous thromboembolism (VTE) using the All of Us database. A total of 926 patients with AA were matched 4:1 to controls without alopecia. Initial findings showed a statistically significant increase in VTE incidence among AA patients (p = 0.009). However, after adjusting for common hypercoagulable factors such as atrial fibrillation, obesity, and smoking history, the study found no significant difference in VTE incidence between those with and without AA (OR: 1.549, CR 95% (0.862, 2.783)). Thus, the study concludes that alopecia areata does not increase the risk of venous thromboembolism when accounting for these factors.