Despite the strong association between vaginal childbirth and pelvic floor dysfunction, genetic factors, pregnancy, advancing age, and lifestyle also play a role. The pelvic floor undergoes substantial changes during pregnancy, which may contribute to pelvic floor dysfunction. Conversely, these changes may be favorable for vaginal delivery. However, there is a lack of studies assessing pelvic floor symptoms over time according to delivery mode and including predelivery assessment.

This study aimed to describe urinary incontinence, vaginal symptoms, and bowel control symptoms from 21 weeks of gestation in the first pregnancy up to 8 years after the first delivery, stratified by delivery mode.

This was a longitudinal observational cohort study. A total of 300 nulliparous women were recruited during their first pregnancy. Pelvic floor symptoms were assessed at 21 and 37 weeks of gestation, and at 6 weeks, 6 months, 12 months, and 8 years after first delivery using the International Consultation on Incontinence Questionnaire modules: the urinary incontinence sum score, the weighted vaginal symptom sum score, the vaginal-associated quality of life score, the bowel control sum score, and the bowel-associated quality of life sum score. Delivery mode at first delivery defined delivery groups as: normal vaginal, operative vaginal, and cesarean delivery. A linear mixed-model analysis was used to assess symptom scores over time and differences in symptom scores between the delivery groups.

Of the 300 women included in the study, 193 attended the 8-year follow-up. Pelvic floor symptoms differed between women who had vaginal delivery and those who had cesarean delivery. The symptom scores showed a nonlinear statistically significant trend. In women who delivered vaginally, there was an increase of urinary incontinence and vaginal symptom scores already during pregnancy. In women who later delivered by cesarean, there was a decrease of symptom scores during pregnancy, and overall lower symptom scores relative to women who had vaginal delivery at 12 months after the first delivery. Pelvic floor symptom scores increased from 12 months to 8 years after the first delivery and exceeded pregnancy levels in all delivery groups; however, overall symptom scores were low. Differences between delivery groups were not statistically significant.

Pelvic floor symptoms differed between women who had vaginal delivery and those who had cesarean delivery from the first pregnancy up to 8 years after the first delivery. These differences were already recognizable before the first delivery.