A bloody vaginal discharge after menopause is commonly due to dryness and thinning of vaginal tissue from lack of estrogen. Vaginal infections such as yeast or bacterial vaginosis are another culprit. Bleeding originating from the cervix can occur if there is a benign cervical polyp or cervical inflammation. Many sexually transmitted infections can cause cervical bleeding; if there is a new partner in your life, it is a good idea to be screened for chlamydia, gonorrhea and trichomonas. Cervical and vaginal cancers can also cause bleeding, but are less common.
Abnormal bleeding from the cavity of the uterus is caused by hormonal imbalances, benign growths such as polyps or fibroids, pre-cancer or cancer.