Original Investigation

Hidradenitis Suppurativa and Smoking, Obesity, Psoriasis, Inflammatory Bowel Disease, and Systemic Sclerosis

JAMA Dermatology 10.1001/jamadermatol.2025.5010

December 17, 2025 at 11:00 AM EST

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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)?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.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.

Corresponding Author: Rune Kjærsgaard Andersen, MD, PhD, Department of Dermatology and Allergy, Herlev and Gentofte Hospital, Copenhagen University Hospitals, Gentofte, Denmark (rune.kjaersgaard.andersen@regionh.dk).

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