There are many causes of postmenopausal bleeding, and the most common is hormone replacement therapy. Women who are taking hormone replacement therapy very often may develop PMB because the uterine lining is very sensitive to estrogen, which promotes growth of the endometrium, just as it does in the normal reproductive cycle that was operative prior to menopause. Lack of estrogen, on the other hand, may cause atrophy of the lining, and in this condition, the blood vessels of the uterine lining become so fragile because of estrogen lack that they spontaneously break and then bleed.
Polyps and fibroids are common benign growths that develop in the uterine cavity. The former is most often associated with irregular light spotting, staining or actual light bleeding. The latter may also present this way, but in fact may be associated with much heavier bleeding.
Overgrowths of the uterine lining are called "hyperplasias", may be the cause of abnormal post-menopausal bleeding, Some specific types are associated with a malignant potential. About 20 % of true post-menopausal bleeders may have cancer of the endometrium (the uterine lining)
I know it's hard not to worry. You're doing the best thing you can by seeing the doctor to find the reason. Good luck to you.
What would cause bleeding after menopause?
Linear Mode
