In OBG out-patient department abnormal uterine bleeding (AUB) is one of the commonest presenting symptoms. This condition is caused by a variety of systemic illnesses or it may be related to pregnancy, polyps, fibroids, adenomyosis, anovulation or neoplasia. Endometrial biopsy could be used as the first diagnostic step & it is effectively qualitative in AUB. This study was done for evaluation of spectrum of lesions of endometrium by histopathology and to find the cause of AUB, in different age groups.