Incidence of benign anal diseases after bariatric surgery

•The frequency of development of benign anal disorders (BAD) after a bariatric surgery (BS) is scarcely studied.•The frequency of BAD after BS was 3.8% during a mean follow-up time of 41 months.•The estimated incidence density of BAD after BS was 11.1 events per 1,000 person-years.•The type of bariatric surgery or the modification of the bowel habit after surgery does not affect the incidence of BAD.