Irregular bleeding can also be the result of endometrialpolyps, overgrowths in the lining of the uterus, and can even be a sign of pre-cancer or cancer of the uterus.
Endometrialpolyps are typically identified during the evaluation of abnormal bleeding and may be found either on ultrasound or by endometrial biopsy, an office procedure that samples the lining of the uterus.