The objective of this randomized, clinical trial is to investigate the effect of metformin and megestrol with megestrol only on histologic endometrial cells in patients with proliferative and hyperplastic endometrium without atypia. 84 patients in equal groups, 42 participant in each group with abnormal uterine bleeding and having disordered proliferative or hyperplastic endometrium without atypia who have consent to participate were included. Patients who have allergy to metformin, who have renal failure, nausea, vomiting, anorexia, anemia, cutaneous lesions or not satisfied to participate in the study, were excluded. In the first group, metformin 500 mg twice a day with megestrol 40 mg daily and the other group of megestrol acetate (brand Jstyran, made in Persia, now Iran Hormone) will be prescribed 40 mg daily for 3 months. 2 weeks after discontinuation of therapy, again each endometrial biopsy was performed and the pathological samples will be compared to their treatment. Early outcome measures include improvement of the symptoms, response to treatment and endometrial histology.