Introduction: Abnormal uterine bleeding can manifest in various ways and is one of the common reasons for visit to the gynaecology OPD. Finding out the etiology is of paramount importance in the management of abnormal uterine bleeding. Histopathological study of endometrial curettings is one of the key ways to diagnose the cause of abnormal uterine bleeding. Materials and Methods: Study was conducted as a prospective study spanning over 2 year in the pathology Department of KIMS. The study participants include women with abnormal uterine bleeding who are subjected to general physical examination and basic laboratory investigations. Curettage specimens from these patients were subjected to histopathological examination to find out the etiology. Results: Examination was done on curettage specimens of 150 women presenting with abnormal uterine bleeding. The functional causes are more common than organic causes and the proportion increases as the age advances. Hyperplasias either simple, complex or atypical are more common organic etiologies. Endometrial adenocarcinoma is the most common malignancy encountered in the endometrial specimens. Conclusion: There are numerous functional and organic causes that can manifest as abnormal different bleeding. Diagnosis of these causes relies mainly on the histopathological examination of the curettage specimens. Hence management of abnormal uterine bleeding causes depends upon the histopathological diagnosis.