Taking progesterone along with estrogen might cause breast tenderness.

(Women who have not had a hysterectomy must take progesterone along with estrogen to reduce the risk of uterine cancer.)

As a result, women who take progesterone may have monthly bleeding.

Monthly bleeding can be lessened and, in some cases, eliminated by taking progesterone and estrogen together continuously.

Women who have had a hysterectomy (removal of the uterus through surgery) usually do not need to take progesterone.

But most research shows that bed rest does not prevent miscarriage.8 Taking progesterone.

While pregnant with her, Ms. Coventry's mother took progesterone in an effort to prevent miscarriage.

An increased risk of endometrial cancer (if a woman still has her uterus and is not taking progesterone along with estrogen).

Nancy began taking progesterone in the hope that the hormone would make her uterus more receptive to an implanting embryo.

So should women taking phytoestrogens also be taking progesterone?