title: Inflammatory bowel disease is associated with hidradenitis suppurativa: Results from a multicenter cross-sectional study.
abstract: BACKGROUND
  Hidradenitis suppurativa (HS) is often associated with inflammatory bowel disease (IBD; Crohn's disease or ulcerative colitis). However, the prevalence of IBD in HS patients is unknown.
  
  
  OBJECTIVE
  To determine the prevalence of IBD in HS patients, and determine if patients with HS and IBD have a distinct HS phenotype.
  
  
  METHODS
  For this multicenter, cross-sectional study, HS patients were asked during their first consultation if they had IBD. The diagnosis of IBD was checked in the medical files, and clinical characteristics were collected.
  
  
  RESULTS
  IBD had a prevalence of 3.3% (95% CI 2.3-4.4) in 1076 HS patients. The prevalence of Crohn's disease was 2.5% (95% CI 1.6-3.4) and the prevalence of ulcerative colitis was 0.8% (95% CI 0.3-1.4). HS-IBD patients were less frequently obese (13.9% vs 31.2%, P = .04) than HS-only patients, but there were no differences in gender, family history of HS, disease severity, body areas affected by HS, or smoking status.
  
  
  CONCLUSIONS
  The prevalence might be underestimated since HS patients might still develop IBD.
  
  
  CONCLUSIONS
  The prevalence of IBD in HS patients (3.3%) is 4-8 times higher than the prevalence in the general northern European population (0.41%-0.74%), however HS-IBD patients do not have a distinct HS phenotype.
authors: Department of Dermatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
authors: Inge E
authors: IE
authors: Deckers
authors: Department of Dermatology, Hôpital Erasme, Université Libre de Bruxelles, Bruxelles, Belgium.
authors: Farida
authors: F
authors: Benhadou
authors: Department of Dermatology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
authors: Marjolein J
authors: MJ
authors: Koldijk
authors: Department of Dermatology, Hôpital Erasme, Université Libre de Bruxelles, Bruxelles, Belgium.
authors: Veronique
authors: V
authors: Del Marmol
authors: Department of Dermatology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
authors: Barbara
authors: B
authors: Horváth
authors: Department of Dermatology, Deventer Hospital, Deventer, The Netherlands.
authors: Jurr
authors: J
authors: Boer
authors: Department of Dermatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
authors: Hessel H
authors: HH
authors: van der Zee
authors: Department of Dermatology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands. Electronic address: e.prens@erasmusmc.nl.
authors: Errol P
authors: EP
authors: Prens
mesh_terms: D000328:Adult; D003093:Colitis, Ulcerative / Q000453:epidemiology*; D003424:Crohn Disease / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D005260:Female; D017497:Hidradenitis Suppurativa / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology; D010641:Phenotype; D015995:Prevalence; D012307:Risk Factors; D055815:Young Adult
keywords: Crohn's disease; acne inversa; association; comorbidity; epidemiology; prevalence; risk factor; ulcerative colitis