Womens Health

Bleeding While on Hormone Replacement

Frederick R. Jelovsek MD

\\\"Is it normal for a woman on Natural Hormone Replacement (from a compounding pharmacy) to experience a period after 2 and one-half months on the NHR? I have not had a \\\"real\\\" period for 2 years. Can hormones initiate ovulation AGAIN??

I am 50, post menopausal, history of normal periods. The only other medication I take is Lipitor 10mg. Excellent health. Normal weight.\\\"
- Kris

A woman who starts on hormonal replacement therapy (HRT) after the menopause can have bleeding on any hormonal regimen, natural or not. As far as studies go, there do not seem to be differences in the incidence or amount of bleeding depending on what type of HRT is used. It only varies by the relative doses of the estrogens and progesterone/progestin and by whether those ingredients are both taken every day continuously or in a cyclical fashion with the estrogen every day and the progesterone/progestin for two weeks out of four.

Why do women have bleeding while on hormonal replacement therapy?

Most women have some bleeding in the first three months on HRT. It is the rule rather than the exception. The main reasons for bleeding are: too much endometrial tissue stimulated by estrogen or too thin a lining (atrophic) due to too high a progesterone effect. There is a third possibility and that is that there is abnormal tissue inside the uterus like a polyp, premalignant hyperplasia or even a cancer.Bleeding during the first three months of HRT is usually attributed to a hormonal cause. Bleeding after that needs to be investigated to make sure there is not a malignancy.

On a continuous hormonal regimen, only about 2/3\\\'s of women stop bleeding at all by 6 months. By one year almost 80% of women will have no bleeding on oral medications and over 85% on transdermal combined therapy (1). If women take HRT cyclically, they usually have some withdrawal bleeding each month. Thus a cyclical regimen makes bleeding more predictable but you still have regular menses.

Can hormone replacement cause a woman to ovulate again?

Rarely, estrogen can induce ovulation in women who have ovarian failure and are menopausal. We do not know how often it occurs and most studies about this have been performed on women who had a premature menopause (below age 40) and not on women undergoing natural menopause in the late 40\\\'s and early 50\\\'s (2). When women with premature menopause underwent a randomized clinical trial in which some were prescribed estrogens and the others placebo, ovulation was induced in 46% of those women although only 25% of women who had been amenorrheic more than 3 months ovulated (3). Certainly the incidence of ovulation must go down as a woman is further removed in time from stopping menses but we do not know what the time period is to absolutely no ovulations induced by HRT. I would guess that at age 50 and being 2 years post menopause would make ovulation very rare indeed.

Table of Contents
1. Bleeding on HRT
2. How to stop it
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