Fibroids or leiomyomas are the most common benign tumors of the upper portion of the female genital tract; They can reach large sizes and generally do not require surgical treatment during pregnancy. Most of these masses present asymptomatically and are discovered as an incidental finding in ultrasounds during pregnancy or at termination in the case of a cesarean section. Knowing the prevalence of fibroids in the pregnant population is of utmost importance to understand its possible impact on the health of the mother and fetus. Determining the prevalence and evolution of fibroids during pregnancy allows us to identify the number of women with this condition that may be affected by this pathology. The objective of this study is to evaluate the prevalence and evolution of uterine fibroids during pregnancy and determine their complications in women between 20 and 45 years old at the Medical Center and Medical FOB Specialties of Guayaquil. From the results of this study it can be concluded that fibroids during pregnancy are related to maternal age and their size does not increase, but rather tends to decrease. Its association with pregnancy increases the risk of complications. Pregnant patients with fibroids have a higher risk of uterine atony and bleeding after cesarean section than patients who terminated their pregnancy by delivery. Understanding the prevalence of fibroids during pregnancy is crucial to improve knowledge, clinical management, and prevention and care strategies in this population