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A variety of hormones have been shown to play a role in affective disorders. Reproductive steroids are particularly informative in our efforts to understand the pathophysiology of affective dysregulation for several reasons: i) Reproductive endocrine-related mood disorders (premenstrual dysphoric disorder, perinatal depression, perimenopausal depression) are wonderful clinical models for investigating the mechanisms by which affective state changes occur; ii) Reproductive steroids regulate virtually every system that has been implicated as disturbed in the ontogeny of affective disorders; iii) Despite the absence of a reproductive endocrinopathy a triggering role in the affective disturbance of reproductive mood disorders has been shown clearly for changes in reproductive steroids. The existing data, therefore, support a differential sensitivity to reproductive steroids in reproductive mood disorders such that an abnormal affective state is precipitated by normal changes in reproductive steroids. The therapeutic implications of these findings for affective illness are discussed.