This paper reports 24 cases of genital organic diseases which were misdiagnosed as dysfunctional uterine bleeding during 1984-1990. These include small submucous uterine myoma 5 cases, Granulosa cell tumor of ovary 2 cases, leiomyosarcoma of uterus 1 case, ectopic pregnancy 7 cases, carcinoma of endometrium 4 cases, abortion 3 cases, choriocarcinoma 2 cases, altogether there were 9 patients with malignant tumors in the series. The author point out that it is possible to reduce the misdiagnosis rate by emphasizing history, diagnostic curettage, ultrasonography, hysteroscopy and blood hCG determination.