Background: The intrauterine contraceptive device is one of the most frequently used method of contraception allover the world. The most important adverse effects related to copper intrauterine contraceptive device use are excessive uterine bleeding and menstrual pain which are responsible for 5-15% removal rate of IUD during the first year of its insertion. Objectives: The aim of the present study is to evaluate subendometrial blood flow in cases of menorrhagia after copper IUCD insertion in comparison to cases using IUCD and not complaining of abnormal uterine bleeding. Patients and Methods: This study included 200 women; divided into two groups. Group I; included 100 women using copper intrauterine device and complaining of menorrhagia, Group II; included 100 women using copper IUD and not complaining of abnormal uterine bleeding. Results: As regard to Doppler findings, it was noted that PI, RI of uterine arteries were significantly lower in group I in comparison to group II (p value <0.001), and by power Doppler energy women in group I with menorrhagia had a significant increase in subendometrial blood flow according to the subendometrial signal area percentage in comparison with women in group II using copper IUD and not complaining of abnormal uterine bleeding (control group). Conclusion: The results of our study revealed that uterine artery and subendometrial blood flow were increased in women with copper IUD induced menorrhagia in comparison to women with copper IUD and not complaining of abnormal uterine bleeding