Urinary Tract Infection in Pregnancy By Lara A Friel, MD, PhD, University of Texas Health Medical School at Houston, McGovern Medical School Reviewed / Revised Oct 2021 | Modified Sep 2022 View Patient Education Diagnosis Treatment Key Points Urinary tract infection (UTI) is common during pregnancy, apparently because of urinary stasis, which results from hormonal ureteral dilation, hormonal ureteral hypoperistalsis, and pressure of the expanding uterus against the ureters.