This study outlines the efficacy of oral contraceptive in the treatment of endometrial polyps (EPs) sized less than 1.5 cm. Design: a randomized controlled clinical trial. Patients: 50 women, who are of childbearing age and have asymptomatic EPs smaller than 1.5 cm. Women will be assigned to two groups consist of 25 persons in each. Inclusion criteria will be: all women who are of childbearing age, have asymptomatic EPs smaller than 1.5 cm, aged 20 to 40 years, and the EPs randomly determined by vaginal ultrasound methods. Exclusion criteria will be: patients with history of oral contraceptive intake, infertility, pelvic pain, liver disease, thrombo-embolism, diabetes, hypertension, uterine fibroma and adenomyosis, infertility due to non-uterine causes, ... Intervention: Oral contraceptives periodically for 3 months. Main outcome measures: vaginal ultrasonography and measuring EPs size at beginning of the study and after 3 months.