This study evaluated the prevalence of irritative bladder symptoms of women in the third trimester of pregnancy and the correlation to parity and route of delivery. Between June and October 2003, 340 women attending the prenatal clinic at the Department of Obstetrics and Gynecology, State University of Campinas (Unicamp) were selected for study. On the total, 80.6% presented nocturia, 70.3% presented urinary frequency and 44.4% presented urgency. No statistic correlation was observed between irritative bladder symptoms and route of delivery however, when considering parity, nocturia and urinary frequency were significantly more frequent in multiparous women. In the population under study pregnancy per se was associated to a high prevalence of irritative bladder symptoms.52153-6