The histopathological examination of the endometrium in cases of abnormal functional uterine bleeding frequently reveals the type of functional disturbance and assists correct treatment. On this basis, 7,000 endometrial curettages from patients with abnormal uterine bleeding were studied. The 1,282 cases with no endometrium in phase, organic changes, or systemic disorders were defined as dysfunctional uterine bleeding; the endometrial lesions were then classified and the histological findings correlated with the patients’ ages. The endometrial curettages revealed an anovulatory cycle in 984 (77%) of the patients, and an ovulatory cycle in 298 (23%). Of the cases with an anovulatory cycle, 446 patients (47.5%) showed endometrial hyperplasia, 412 (41.86%) showed abnormal endometrial proliferation due to prolonged persistence of a follicle, while 106 (10.77%) showed deficient endometrial proliferation. Three hundred and thirty four cases (71.67%) of endometrial hyperplasia were (simple) cystic hyperplasias, 124 (26.60%) were (complex) adenomatous hyperplasia, and 8 (1.71%) were atypical hyperplasia. Of the cases with an ovulatory cycle, 252 (84.56%) showed deficient endometrial secretion due to a prolonged proliferative phase, while the other 46 (15.43%) showed deficient secretion due to luteal phase defect. Seven hundred and thirty six patients with an anovulatory cycle and 212 with an ovulatory cycle-i.e. 948 (74%) of the 1282 patients studied-were at the climacteric. The conclusions may be summarised as follows. i) Dysfunctional abnormal uterine bleeding was found more often at the climacteric and chiefly in the form of an anovulatory endometrium; ii) 88.14% of cases (1130 patients) presented histological signs of oestrogen influence in the form of either an anovulatory endometrium or an ovulatory endometrium; iii) Cystic (simple) hyperplasia was the most common form of endometrial hyperplasia.