What are common causes for abnormal uterine bleeding amongst premenopausal woman?

The common causes include fibroids, adenomyosis, hormonal imbalance, endometrial polyps and even cancer of the uterus, cervix and ovaries. Sometimes after all investigations are completed, there may be no known cause found. In these cases, it is called dysfunctional uterine bleeding and is usually a diagnosis of exclusion. If the abnormal uterine bleeding is prolonged or fails to resolve spontaneously on its own after several months, then it is best to see a gynaecologist for treatment and to exclude serious causes.