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Estrogens are normal hormones produced by the female body.
They are important for the sexual development of females, as well as for regulating function of the menstrual cycle. Estrogens are used in the treatment of certain types of breast cancer in men and women, and certain kinds of prostate cancer in men. Estrogens provide additional hormones following certain kinds of surgery as well as during and after menopause . Nausea may be experienced during the first few weeks on the medication. It should soon disappear.