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Removal of one ovary still allows a woman to continue to menstruate and to have children, as long as the remaining ovary is not damaged. When both ovaries are removed, menstrual periods stop, a woman can no longer become pregnant, and estrogen and progesterone are no longer produced by the reproductive system.
However, the ovaries might also be removed as a companion procedure to a hysterectomy, if medically necessary. In premenopausal women, removal of the ovaries during a hysterectomy leads to a sudden drop in the levels of the ovarian hormones estrogen and progesterone -- a situation known as surgical menopause.