Treatment is recommended until the average age of the natural menopause. HRT is the treatment to augment the body's natural hormonal levels, either in the form of estrogen therapy (ET), for women who have had hysterectomy (or surgical menopause) or as estrogen with progesterone therapy (EPT), for women who experience menopause naturally or for some surgical menopause such as after hysterectomy and bilateral oophorectomy due to endometriosis. The importance of HRT is to relieve menopausal symptoms such as vasomotor symptoms and to prevent health impact due to estrogen deficiency, especially in young surgical menopauses.