Higher BMI and inflammatory bowel disease were causally linked to increased risk of HidradenitisSuppurativa, while the association with smoking was inconclusive after sensitivity analyses.
Question Is there an effect of body mass index (BMI, calculated as weight in kilograms divided by height in meters squared) and/or smoking on the risk of developing hidradenitis suppurativa (HS)?
Findings This mendelian randomization study including 3 592 596 patients found an effect of BMI on HS risk. Although initially a similar risk of smoking on HS was found, sensitivity analyses revealed inconclusive results potentially due to lack of power.
Meaning The findings of this study support a causal effect of increased BMI on the risk of developing HS; this information may help physicians better inform patients about disease risk contributed by modifiable lifestyle behaviors, knowledge that can be beneficial for planning subsequent lifestyle interventions.








